바코드 업데이트 및 AI LLm 적용용

ai-assistant/.env.example

@@ -0,0 +1,25 @@
+# AI Assistant API (VEXPLOR 내장) - 환경 변수
+# 이 파일을 .env 로 복사한 뒤 값 설정
+
+NODE_ENV=development
+PORT=3100
+
+# PostgreSQL (AI 어시스턴트 전용 DB)
+DB_HOST=localhost
+DB_PORT=5432
+DB_USER=ai_assistant
+DB_PASSWORD=ai_assistant_password
+DB_NAME=ai_assistant_db
+
+# JWT
+JWT_SECRET=your-super-secret-jwt-key-change-in-production
+JWT_EXPIRES_IN=7d
+JWT_REFRESH_SECRET=your-refresh-secret-key-change-in-production
+JWT_REFRESH_EXPIRES_IN=30d
+
+# LLM (구글 키 등)
+GEMINI_API_KEY=your-gemini-api-key
+GEMINI_MODEL=gemini-2.0-flash
+
+RATE_LIMIT_WINDOW_MS=60000
+RATE_LIMIT_MAX_REQUESTS=100

ai-assistant/Dockerfile.win

@@ -0,0 +1,17 @@
+# AI 어시스턴트 API - Docker (Windows 개발용)
+FROM node:20-bookworm-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends wget ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY . .
+
+ENV NODE_ENV=development
+EXPOSE 3100
+
+CMD ["node", "src/app.js"]

ai-assistant/README.md

@@ -0,0 +1,43 @@
+# AI 어시스턴트 API (VEXPLOR 내장)
+
+VEXPLOR와 **같은 서비스**로 동작하도록 이 API는 포트 3100에서 구동되고, backend-node가 `/api/ai/v1` 요청을 여기로 프록시합니다.
+
+## 동작 방식
+
+- **프론트(9771)** → `/api/ai/v1/*` 호출
+- **Next.js** → `8080/api/ai/v1/*` 로 rewrite
+- **backend-node(8080)** → `3100/api/v1/*` 로 프록시 → **이 서비스**
+
+따라서 사용자는 **다른 포트를 쓰지 않고** VEXPLOR만 켜도 AI 기능을 사용할 수 있습니다.
+
+## 서비스 올리는 순서 (한 번에 동작하게)
+
+1. **AI 어시스턴트 API (이 폴더, 포트 3100)**  
+   ```bash
+   cd ai-assistant
+   npm install
+   cp .env.example .env   # 필요 시 DB, JWT, GEMINI_API_KEY 등 수정
+   npm start
+   ```
+
+2. **backend-node (포트 8080)**  
+   ```bash
+   cd backend-node
+   npm run dev
+   ```
+
+3. **프론트 (포트 9771)**  
+   ```bash
+   cd frontend
+   npm run dev
+   ```
+
+브라우저에서는 `http://localhost:9771` 만 사용하면 되고, AI API는 같은 오리진의 `/api/ai/v1` 로 호출됩니다.
+
+## 환경 변수
+
+- `.env.example` 을 `.env` 로 복사 후 수정
+- `PORT=3100` (기본값)
+- PostgreSQL: `DB_*`
+- JWT: `JWT_SECRET`, `JWT_REFRESH_SECRET`
+- LLM: `GEMINI_API_KEY` 등

ai-assistant/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "ai-assistant-api",
+  "version": "1.0.0",
+  "description": "AI Assistant API (VEXPLOR 내장) - 포트 3100에서 구동, backend-node가 /api/ai/v1 로 프록시",
+  "private": true,
+  "main": "src/app.js",
+  "scripts": {
+    "start": "node src/app.js",
+    "dev": "nodemon src/app.js"
+  },
+  "dependencies": {
+    "@google/genai": "^1.0.0",
+    "axios": "^1.6.0",
+    "bcryptjs": "^2.4.3",
+    "compression": "^1.7.4",
+    "cors": "^2.8.5",
+    "dotenv": "^16.4.1",
+    "express": "^4.18.2",
+    "express-rate-limit": "^7.1.5",
+    "express-validator": "^7.0.1",
+    "helmet": "^7.1.0",
+    "jsonwebtoken": "^9.0.2",
+    "pg": "^8.11.3",
+    "pg-hstore": "^2.3.4",
+    "sequelize": "^6.35.2",
+    "swagger-jsdoc": "^6.2.8",
+    "swagger-ui-express": "^5.0.1",
+    "uuid": "^9.0.1",
+    "winston": "^3.11.0",
+    "zod": "^3.22.4"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.3"
+  },
+  "engines": {
+    "node": ">=18.0.0"
+  }
+}

ai-assistant/src/app.js

@@ -0,0 +1,186 @@
+// src/app.js
+// AI Assistant API 서버 메인 엔트리포인트
+
+require('dotenv').config();
+
+const express = require('express');
+const cors = require('cors');
+const helmet = require('helmet');
+const compression = require('compression');
+const rateLimit = require('express-rate-limit');
+const swaggerUi = require('swagger-ui-express');
+const swaggerSpec = require('./config/swagger.config');
+
+const logger = require('./config/logger.config');
+const { sequelize } = require('./models');
+const routes = require('./routes');
+const errorHandler = require('./middlewares/error-handler.middleware');
+
+const app = express();
+// VEXPLOR 내장 시 backend-node가 이 포트로 프록시하므로 기본 3100 사용
+const PORT = process.env.PORT || 3100;
+
+// ===========================================
+// 미들웨어 설정
+// ===========================================
+
+// Trust proxy (Docker/Nginx 환경)
+app.set('trust proxy', 1);
+
+// CORS 설정 (helmet보다 먼저 설정)
+app.use(cors({
+  origin: true, // 모든 origin 허용
+  credentials: true,
+  methods: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'],
+  allowedHeaders: ['Content-Type', 'Authorization', 'X-Requested-With'],
+}));
+
+// Preflight 요청 처리
+app.options('*', cors());
+
+// 보안 헤더 (CORS 이후에 설정)
+app.use(helmet({
+  crossOriginResourcePolicy: { policy: 'cross-origin' },
+  crossOriginOpenerPolicy: { policy: 'unsafe-none' },
+}));
+
+// 요청 본문 파싱
+app.use(express.json({ limit: '10mb' }));
+app.use(express.urlencoded({ extended: true }));
+
+// 압축
+app.use(compression());
+
+// Rate Limiting (전역)
+const limiter = rateLimit({
+  windowMs: parseInt(process.env.RATE_LIMIT_WINDOW_MS, 10) || 60000,
+  max: parseInt(process.env.RATE_LIMIT_MAX_REQUESTS, 10) || 100,
+  message: {
+    success: false,
+    error: {
+      code: 'RATE_LIMIT_EXCEEDED',
+      message: '요청 한도를 초과했습니다. 잠시 후 다시 시도해주세요.',
+    },
+  },
+  standardHeaders: true,
+  legacyHeaders: false,
+});
+app.use(limiter);
+
+// 요청 로깅
+app.use((req, res, next) => {
+  const start = Date.now();
+  res.on('finish', () => {
+    const duration = Date.now() - start;
+    logger.info(`${req.method} ${req.originalUrl} ${res.statusCode} ${duration}ms`);
+  });
+  next();
+});
+
+// ===========================================
+// 헬스 체크
+// ===========================================
+
+app.get('/health', (req, res) => {
+  res.json({
+    success: true,
+    data: {
+      status: 'healthy',
+      timestamp: new Date().toISOString(),
+      uptime: process.uptime(),
+    },
+  });
+});
+
+// ===========================================
+// Swagger API 문서
+// ===========================================
+
+app.use('/api-docs', swaggerUi.serve, swaggerUi.setup(swaggerSpec, {
+  explorer: true,
+  customCss: '.swagger-ui .topbar { display: none }',
+  customSiteTitle: 'AI Assistant API 문서',
+  swaggerOptions: {
+    persistAuthorization: true,
+    displayRequestDuration: true,
+  },
+}));
+
+// Swagger JSON
+app.get('/api-docs.json', (req, res) => {
+  res.setHeader('Content-Type', 'application/json');
+  res.send(swaggerSpec);
+});
+
+// ===========================================
+// API 라우트
+// ===========================================
+
+app.use('/api/v1', routes);
+
+// ===========================================
+// 404 처리
+// ===========================================
+
+app.use((req, res) => {
+  res.status(404).json({
+    success: false,
+    error: {
+      code: 'NOT_FOUND',
+      message: `요청한 리소스를 찾을 수 없습니다: ${req.method} ${req.originalUrl}`,
+    },
+  });
+});
+
+// ===========================================
+// 에러 핸들러
+// ===========================================
+
+app.use(errorHandler);
+
+// ===========================================
+// 서버 시작
+// ===========================================
+
+async function startServer() {
+  try {
+    // 데이터베이스 연결
+    await sequelize.authenticate();
+    logger.info('✅ 데이터베이스 연결 성공');
+
+    // 테이블 동기화 (테이블이 없으면 생성)
+    await sequelize.sync();
+    logger.info('✅ 데이터베이스 스키마 동기화 완료');
+
+    // 초기 데이터 설정 (관리자 계정, LLM 프로바이더)
+    const initService = require('./services/init.service');
+    await initService.initialize();
+
+    // 서버 시작
+    app.listen(PORT, () => {
+      logger.info(`🚀 AI Assistant API 서버가 포트 ${PORT}에서 실행 중입니다`);
+      logger.info(`📚 API 문서 (Swagger): http://localhost:${PORT}/api-docs`);
+      logger.info(`📚 API 엔드포인트: http://localhost:${PORT}/api/v1`);
+    });
+  } catch (error) {
+    logger.error('❌ 서버 시작 실패:', error);
+    process.exit(1);
+  }
+}
+
+// 프로세스 종료 처리
+process.on('SIGTERM', async () => {
+  logger.info('SIGTERM 신호 수신, 서버 종료 중...');
+  await sequelize.close();
+  process.exit(0);
+});
+
+process.on('SIGINT', async () => {
+  logger.info('SIGINT 신호 수신, 서버 종료 중...');
+  await sequelize.close();
+  process.exit(0);
+});
+
+startServer();
+
+module.exports = app;

ai-assistant/src/controllers/admin.controller.js

@@ -0,0 +1,474 @@
+// src/controllers/admin.controller.js
+// 관리자 컨트롤러
+
+const { LLMProvider, User, UsageLog, ApiKey } = require('../models');
+const { Op } = require('sequelize');
+const logger = require('../config/logger.config');
+
+// ===== LLM 프로바이더 관리 =====
+
+/**
+ * LLM 프로바이더 목록 조회
+ */
+exports.getProviders = async (req, res, next) => {
+  try {
+    const providers = await LLMProvider.findAll({
+      order: [['priority', 'ASC']],
+      attributes: [
+        'id',
+        'name',
+        'displayName',
+        'endpoint',
+        'modelName',
+        'priority',
+        'maxTokens',
+        'temperature',
+        'timeoutMs',
+        'costPer1kInputTokens',
+        'costPer1kOutputTokens',
+        'isActive',
+        'isHealthy',
+        'lastHealthCheck',
+        'createdAt',
+        'updatedAt',
+        // API 키는 마스킹해서 반환
+        'apiKey',
+      ],
+    });
+
+    // API 키 마스킹
+    const maskedProviders = providers.map((p) => {
+      const data = p.toJSON();
+      if (data.apiKey) {
+        // 앞 8자만 보여주고 나머지는 마스킹
+        data.apiKey = data.apiKey.substring(0, 8) + '****' + data.apiKey.slice(-4);
+        data.hasApiKey = true;
+      } else {
+        data.hasApiKey = false;
+      }
+      return data;
+    });
+
+    return res.json({
+      success: true,
+      data: maskedProviders,
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * LLM 프로바이더 추가
+ */
+exports.createProvider = async (req, res, next) => {
+  try {
+    const {
+      name,
+      displayName,
+      endpoint,
+      apiKey,
+      modelName,
+      priority = 50,
+      maxTokens = 4096,
+      temperature = 0.7,
+      timeoutMs = 60000,
+      costPer1kInputTokens = 0,
+      costPer1kOutputTokens = 0,
+    } = req.body;
+
+    // 중복 이름 확인
+    const existing = await LLMProvider.findOne({ where: { name } });
+    if (existing) {
+      return res.status(409).json({
+        success: false,
+        error: {
+          code: 'PROVIDER_EXISTS',
+          message: '이미 존재하는 프로바이더 이름입니다.',
+        },
+      });
+    }
+
+    const provider = await LLMProvider.create({
+      name,
+      displayName,
+      endpoint,
+      apiKey,
+      modelName,
+      priority,
+      maxTokens,
+      temperature,
+      timeoutMs,
+      costPer1kInputTokens,
+      costPer1kOutputTokens,
+      isActive: true,
+      isHealthy: true,
+    });
+
+    logger.info(`LLM 프로바이더 추가: ${name} (${modelName})`);
+
+    return res.status(201).json({
+      success: true,
+      data: {
+        id: provider.id,
+        name: provider.name,
+        displayName: provider.displayName,
+        modelName: provider.modelName,
+        priority: provider.priority,
+        isActive: provider.isActive,
+        message: 'LLM 프로바이더가 추가되었습니다.',
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * LLM 프로바이더 수정
+ */
+exports.updateProvider = async (req, res, next) => {
+  try {
+    const { id } = req.params;
+    const updates = req.body;
+
+    const provider = await LLMProvider.findByPk(id);
+    if (!provider) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'PROVIDER_NOT_FOUND',
+          message: 'LLM 프로바이더를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    // 허용된 필드만 업데이트
+    const allowedFields = [
+      'displayName',
+      'endpoint',
+      'apiKey',
+      'modelName',
+      'priority',
+      'maxTokens',
+      'temperature',
+      'timeoutMs',
+      'costPer1kInputTokens',
+      'costPer1kOutputTokens',
+      'isActive',
+      'isHealthy',
+    ];
+
+    allowedFields.forEach((field) => {
+      if (updates[field] !== undefined) {
+        provider[field] = updates[field];
+      }
+    });
+
+    await provider.save();
+
+    logger.info(`LLM 프로바이더 수정: ${provider.name}`);
+
+    return res.json({
+      success: true,
+      data: {
+        id: provider.id,
+        name: provider.name,
+        displayName: provider.displayName,
+        modelName: provider.modelName,
+        isActive: provider.isActive,
+        message: 'LLM 프로바이더가 수정되었습니다.',
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * LLM 프로바이더 삭제
+ */
+exports.deleteProvider = async (req, res, next) => {
+  try {
+    const { id } = req.params;
+
+    const provider = await LLMProvider.findByPk(id);
+    if (!provider) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'PROVIDER_NOT_FOUND',
+          message: 'LLM 프로바이더를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    const providerName = provider.name;
+    await provider.destroy();
+
+    logger.info(`LLM 프로바이더 삭제: ${providerName}`);
+
+    return res.json({
+      success: true,
+      data: {
+        message: 'LLM 프로바이더가 삭제되었습니다.',
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+// ===== 사용자 관리 =====
+
+/**
+ * 사용자 목록 조회
+ */
+exports.getUsers = async (req, res, next) => {
+  try {
+    const page = parseInt(req.query.page, 10) || 1;
+    const limit = parseInt(req.query.limit, 10) || 100;
+    const offset = (page - 1) * limit;
+
+    const { count, rows: users } = await User.findAndCountAll({
+      attributes: [
+        'id',
+        'email',
+        'name',
+        'role',
+        'status',
+        'plan',
+        'monthlyTokenLimit',
+        'lastLoginAt',
+        'createdAt',
+      ],
+      order: [['createdAt', 'DESC']],
+      limit,
+      offset,
+    });
+
+    // 페이지네이션 없이 간단한 배열로 반환 (프론트엔드 호환)
+    return res.json({
+      success: true,
+      data: users,
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 사용자 정보 수정
+ */
+exports.updateUser = async (req, res, next) => {
+  try {
+    const { id } = req.params;
+    const { role, status, plan, monthlyTokenLimit } = req.body;
+
+    const user = await User.findByPk(id);
+    if (!user) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'USER_NOT_FOUND',
+          message: '사용자를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    if (role) user.role = role;
+    if (status) user.status = status;
+    if (plan) user.plan = plan;
+    if (monthlyTokenLimit !== undefined) user.monthlyTokenLimit = monthlyTokenLimit;
+
+    await user.save();
+
+    logger.info(`사용자 정보 수정: ${user.email} (role: ${user.role}, status: ${user.status})`);
+
+    return res.json({
+      success: true,
+      data: user.toSafeJSON(),
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+// ===== 시스템 통계 =====
+
+/**
+ * 사용자별 사용량 통계
+ */
+exports.getUsageByUser = async (req, res, next) => {
+  try {
+    const days = parseInt(req.query.days, 10) || 7;
+    const startDate = new Date();
+    startDate.setDate(startDate.getDate() - days);
+    startDate.setHours(0, 0, 0, 0);
+
+    // 사용자별 집계 (raw SQL 사용)
+    const userStats = await UsageLog.sequelize.query(`
+      SELECT 
+        u.id as "userId",
+        u.email,
+        u.name,
+        COALESCE(SUM(ul.total_tokens), 0) as "totalTokens",
+        COALESCE(SUM(ul.cost_usd), 0) as "totalCost",
+        COUNT(ul.id) as "requestCount"
+      FROM users u
+      LEFT JOIN usage_logs ul ON u.id = ul.user_id AND ul.created_at >= :startDate
+      GROUP BY u.id, u.email, u.name
+      HAVING COUNT(ul.id) > 0
+      ORDER BY SUM(ul.total_tokens) DESC NULLS LAST
+    `, {
+      replacements: { startDate },
+      type: UsageLog.sequelize.QueryTypes.SELECT,
+    });
+
+    // 데이터 정리
+    const result = userStats.map((stat) => ({
+      userId: stat.userId,
+      email: stat.email || 'Unknown',
+      name: stat.name || '',
+      totalTokens: parseInt(stat.totalTokens, 10) || 0,
+      totalCost: parseFloat(stat.totalCost) || 0,
+      requestCount: parseInt(stat.requestCount, 10) || 0,
+    }));
+
+    return res.json({
+      success: true,
+      data: result,
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 프로바이더별 사용량 통계
+ */
+exports.getUsageByProvider = async (req, res, next) => {
+  try {
+    const days = parseInt(req.query.days, 10) || 7;
+    const startDate = new Date();
+    startDate.setDate(startDate.getDate() - days);
+    startDate.setHours(0, 0, 0, 0);
+
+    // 프로바이더별 집계 (컬럼명 수정: providerName, modelName)
+    const providerStats = await UsageLog.findAll({
+      where: {
+        createdAt: { [Op.gte]: startDate },
+      },
+      attributes: [
+        'providerName',
+        'modelName',
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('total_tokens')), 'totalTokens'],
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('prompt_tokens')), 'promptTokens'],
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('completion_tokens')), 'completionTokens'],
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('cost_usd')), 'totalCost'],
+        [UsageLog.sequelize.fn('COUNT', UsageLog.sequelize.col('id')), 'requestCount'],
+        [UsageLog.sequelize.fn('AVG', UsageLog.sequelize.col('response_time_ms')), 'avgResponseTime'],
+      ],
+      group: ['providerName', 'modelName'],
+      order: [[UsageLog.sequelize.literal('"totalTokens"'), 'DESC']],
+      raw: true,
+    });
+
+    // 데이터 정리
+    const result = providerStats.map((stat) => ({
+      provider: stat.providerName || 'Unknown',
+      model: stat.modelName || 'Unknown',
+      totalTokens: parseInt(stat.totalTokens, 10) || 0,
+      promptTokens: parseInt(stat.promptTokens, 10) || 0,
+      completionTokens: parseInt(stat.completionTokens, 10) || 0,
+      totalCost: parseFloat(stat.totalCost) || 0,
+      requestCount: parseInt(stat.requestCount, 10) || 0,
+      avgResponseTime: Math.round(parseFloat(stat.avgResponseTime) || 0),
+    }));
+
+    return res.json({
+      success: true,
+      data: result,
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 시스템 통계 조회
+ */
+exports.getStats = async (req, res, next) => {
+  try {
+    // 전체 사용자 수
+    const totalUsers = await User.count();
+    const activeUsers = await User.count({ where: { status: 'active' } });
+
+    // 전체 API 키 수
+    const totalApiKeys = await ApiKey.count();
+    const activeApiKeys = await ApiKey.count({ where: { status: 'active' } });
+
+    // 오늘 사용량
+    const today = new Date();
+    today.setHours(0, 0, 0, 0);
+    const todayUsage = await UsageLog.findOne({
+      where: {
+        createdAt: { [Op.gte]: today },
+      },
+      attributes: [
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('total_tokens')), 'totalTokens'],
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('cost_usd')), 'totalCost'],
+        [UsageLog.sequelize.fn('COUNT', UsageLog.sequelize.col('id')), 'requestCount'],
+      ],
+      raw: true,
+    });
+
+    // 이번 달 사용량
+    const monthStart = new Date(today.getFullYear(), today.getMonth(), 1);
+    const monthlyUsage = await UsageLog.findOne({
+      where: {
+        createdAt: { [Op.gte]: monthStart },
+      },
+      attributes: [
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('total_tokens')), 'totalTokens'],
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('cost_usd')), 'totalCost'],
+        [UsageLog.sequelize.fn('COUNT', UsageLog.sequelize.col('id')), 'requestCount'],
+      ],
+      raw: true,
+    });
+
+    // 활성 프로바이더 수
+    const activeProviders = await LLMProvider.count({ where: { isActive: true, isHealthy: true } });
+
+    return res.json({
+      success: true,
+      data: {
+        users: {
+          total: totalUsers,
+          active: activeUsers,
+        },
+        apiKeys: {
+          total: totalApiKeys,
+          active: activeApiKeys,
+        },
+        providers: {
+          active: activeProviders,
+        },
+        usage: {
+          today: {
+            tokens: parseInt(todayUsage?.totalTokens, 10) || 0,
+            cost: parseFloat(todayUsage?.totalCost) || 0,
+            requests: parseInt(todayUsage?.requestCount, 10) || 0,
+          },
+          monthly: {
+            tokens: parseInt(monthlyUsage?.totalTokens, 10) || 0,
+            cost: parseFloat(monthlyUsage?.totalCost) || 0,
+            requests: parseInt(monthlyUsage?.requestCount, 10) || 0,
+          },
+        },
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};

ai-assistant/src/controllers/api-key.controller.js

@@ -0,0 +1,215 @@
+// src/controllers/api-key.controller.js
+// API 키 컨트롤러
+
+const { ApiKey } = require('../models');
+const logger = require('../config/logger.config');
+
+/**
+ * API 키 발급
+ */
+exports.create = async (req, res, next) => {
+  try {
+    const { name, expiresInDays, permissions } = req.body;
+    const userId = req.user.userId;
+
+    // API 키 생성
+    const rawKey = ApiKey.generateKey();
+    const keyHash = ApiKey.hashKey(rawKey);
+    const keyPrefix = rawKey.substring(0, 12);
+
+    // 만료 일시 계산
+    let expiresAt = null;
+    if (expiresInDays) {
+      expiresAt = new Date();
+      expiresAt.setDate(expiresAt.getDate() + expiresInDays);
+    }
+
+    const apiKey = await ApiKey.create({
+      userId,
+      name,
+      keyPrefix,
+      keyHash,
+      permissions: permissions || ['chat:read', 'chat:write'],
+      expiresAt,
+    });
+
+    logger.info(`API 키 발급: ${name} (user: ${userId})`);
+
+    // 주의: 원본 키는 이 응답에서만 반환됨 (다시 조회 불가)
+    return res.status(201).json({
+      success: true,
+      data: {
+        id: apiKey.id,
+        name: apiKey.name,
+        key: rawKey, // 원본 키 (한 번만 표시)
+        keyPrefix: apiKey.keyPrefix,
+        permissions: apiKey.permissions,
+        expiresAt: apiKey.expiresAt,
+        createdAt: apiKey.createdAt,
+        message: '⚠️ API 키는 이 응답에서만 확인할 수 있습니다. 안전한 곳에 저장하세요.',
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * API 키 목록 조회
+ */
+exports.list = async (req, res, next) => {
+  try {
+    const userId = req.user.userId;
+
+    const apiKeys = await ApiKey.findAll({
+      where: { userId },
+      attributes: [
+        'id',
+        'name',
+        'keyPrefix',
+        'permissions',
+        'rateLimit',
+        'status',
+        'expiresAt',
+        'lastUsedAt',
+        'totalRequests',
+        'createdAt',
+      ],
+      order: [['createdAt', 'DESC']],
+    });
+
+    return res.json({
+      success: true,
+      data: apiKeys,
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * API 키 상세 조회
+ */
+exports.get = async (req, res, next) => {
+  try {
+    const { id } = req.params;
+    const userId = req.user.userId;
+
+    const apiKey = await ApiKey.findOne({
+      where: { id, userId },
+      attributes: [
+        'id',
+        'name',
+        'keyPrefix',
+        'permissions',
+        'rateLimit',
+        'status',
+        'expiresAt',
+        'lastUsedAt',
+        'totalRequests',
+        'createdAt',
+        'updatedAt',
+      ],
+    });
+
+    if (!apiKey) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'API_KEY_NOT_FOUND',
+          message: 'API 키를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    return res.json({
+      success: true,
+      data: apiKey,
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * API 키 수정
+ */
+exports.update = async (req, res, next) => {
+  try {
+    const { id } = req.params;
+    const { name, status } = req.body;
+    const userId = req.user.userId;
+
+    const apiKey = await ApiKey.findOne({
+      where: { id, userId },
+    });
+
+    if (!apiKey) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'API_KEY_NOT_FOUND',
+          message: 'API 키를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    if (name) apiKey.name = name;
+    if (status) apiKey.status = status;
+
+    await apiKey.save();
+
+    logger.info(`API 키 수정: ${apiKey.name} (id: ${id})`);
+
+    return res.json({
+      success: true,
+      data: {
+        id: apiKey.id,
+        name: apiKey.name,
+        keyPrefix: apiKey.keyPrefix,
+        status: apiKey.status,
+        updatedAt: apiKey.updatedAt,
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * API 키 폐기
+ */
+exports.revoke = async (req, res, next) => {
+  try {
+    const { id } = req.params;
+    const userId = req.user.userId;
+
+    const apiKey = await ApiKey.findOne({
+      where: { id, userId },
+    });
+
+    if (!apiKey) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'API_KEY_NOT_FOUND',
+          message: 'API 키를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    apiKey.status = 'revoked';
+    await apiKey.save();
+
+    logger.info(`API 키 폐기: ${apiKey.name} (id: ${id})`);
+
+    return res.json({
+      success: true,
+      data: {
+        message: 'API 키가 폐기되었습니다.',
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};

ai-assistant/src/controllers/auth.controller.js

@@ -0,0 +1,195 @@
+// src/controllers/auth.controller.js
+// 인증 컨트롤러
+
+const jwt = require('jsonwebtoken');
+const { User } = require('../models');
+const logger = require('../config/logger.config');
+
+const JWT_SECRET = process.env.JWT_SECRET || 'your-secret-key';
+const JWT_EXPIRES_IN = process.env.JWT_EXPIRES_IN || '7d';
+const JWT_REFRESH_SECRET = process.env.JWT_REFRESH_SECRET || 'your-refresh-secret';
+const JWT_REFRESH_EXPIRES_IN = process.env.JWT_REFRESH_EXPIRES_IN || '30d';
+
+/**
+ * JWT 토큰 생성
+ */
+function generateTokens(user) {
+  const accessToken = jwt.sign(
+    { userId: user.id, email: user.email, role: user.role },
+    JWT_SECRET,
+    { expiresIn: JWT_EXPIRES_IN }
+  );
+
+  const refreshToken = jwt.sign(
+    { userId: user.id },
+    JWT_REFRESH_SECRET,
+    { expiresIn: JWT_REFRESH_EXPIRES_IN }
+  );
+
+  return { accessToken, refreshToken };
+}
+
+/**
+ * 회원가입
+ */
+exports.register = async (req, res, next) => {
+  try {
+    const { email, password, name } = req.body;
+
+    // 이메일 중복 확인
+    const existingUser = await User.findOne({ where: { email } });
+    if (existingUser) {
+      return res.status(409).json({
+        success: false,
+        error: {
+          code: 'EMAIL_ALREADY_EXISTS',
+          message: '이미 등록된 이메일입니다.',
+        },
+      });
+    }
+
+    // 사용자 생성
+    const user = await User.create({
+      email,
+      password,
+      name,
+    });
+
+    // 토큰 생성
+    const tokens = generateTokens(user);
+
+    logger.info(`새 사용자 가입: ${email}`);
+
+    return res.status(201).json({
+      success: true,
+      data: {
+        user: user.toSafeJSON(),
+        ...tokens,
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 로그인
+ */
+exports.login = async (req, res, next) => {
+  try {
+    const { email, password } = req.body;
+
+    // 사용자 조회
+    const user = await User.findOne({ where: { email } });
+    if (!user) {
+      return res.status(401).json({
+        success: false,
+        error: {
+          code: 'INVALID_CREDENTIALS',
+          message: '이메일 또는 비밀번호가 올바르지 않습니다.',
+        },
+      });
+    }
+
+    // 비밀번호 검증
+    const isValidPassword = await user.validatePassword(password);
+    if (!isValidPassword) {
+      return res.status(401).json({
+        success: false,
+        error: {
+          code: 'INVALID_CREDENTIALS',
+          message: '이메일 또는 비밀번호가 올바르지 않습니다.',
+        },
+      });
+    }
+
+    // 계정 상태 확인
+    if (user.status !== 'active') {
+      return res.status(403).json({
+        success: false,
+        error: {
+          code: 'ACCOUNT_INACTIVE',
+          message: '계정이 비활성화되었습니다. 관리자에게 문의하세요.',
+        },
+      });
+    }
+
+    // 마지막 로그인 시간 업데이트
+    user.lastLoginAt = new Date();
+    await user.save();
+
+    // 토큰 생성
+    const tokens = generateTokens(user);
+
+    logger.info(`사용자 로그인: ${email}`);
+
+    return res.json({
+      success: true,
+      data: {
+        user: user.toSafeJSON(),
+        ...tokens,
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 토큰 갱신
+ */
+exports.refresh = async (req, res, next) => {
+  try {
+    const { refreshToken } = req.body;
+
+    // 리프레시 토큰 검증
+    let decoded;
+    try {
+      decoded = jwt.verify(refreshToken, JWT_REFRESH_SECRET);
+    } catch (error) {
+      return res.status(401).json({
+        success: false,
+        error: {
+          code: 'INVALID_REFRESH_TOKEN',
+          message: '유효하지 않은 리프레시 토큰입니다.',
+        },
+      });
+    }
+
+    // 사용자 조회
+    const user = await User.findByPk(decoded.userId);
+    if (!user || user.status !== 'active') {
+      return res.status(401).json({
+        success: false,
+        error: {
+          code: 'USER_NOT_FOUND',
+          message: '사용자를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    // 새 토큰 생성
+    const tokens = generateTokens(user);
+
+    return res.json({
+      success: true,
+      data: tokens,
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 로그아웃
+ */
+exports.logout = async (req, res) => {
+  // 클라이언트에서 토큰 삭제 처리
+  // 서버에서는 특별한 처리 없음 (필요시 블랙리스트 구현)
+  return res.json({
+    success: true,
+    data: {
+      message: '로그아웃되었습니다.',
+    },
+  });
+};

ai-assistant/src/controllers/chat.controller.js

@@ -0,0 +1,152 @@
+// src/controllers/chat.controller.js
+// 채팅 컨트롤러 (OpenAI 호환 API)
+
+const llmService = require('../services/llm.service');
+const logger = require('../config/logger.config');
+
+/**
+ * 채팅 완성 API (OpenAI 호환)
+ * POST /api/v1/chat/completions
+ */
+exports.completions = async (req, res, next) => {
+  try {
+    const {
+      model = 'gemini-2.0-flash',
+      messages,
+      temperature = 0.7,
+      max_tokens = 4096,
+      stream = false,
+    } = req.body;
+
+    const startTime = Date.now();
+
+    // 스트리밍 응답 처리
+    if (stream) {
+      return handleStreamingResponse(req, res, {
+        model,
+        messages,
+        temperature,
+        maxTokens: max_tokens,
+      });
+    }
+
+    // 일반 응답 처리
+    const result = await llmService.chat({
+      model,
+      messages,
+      temperature,
+      maxTokens: max_tokens,
+      userId: req.user.id,
+      apiKeyId: req.apiKey?.id,
+    });
+
+    const responseTime = Date.now() - startTime;
+
+    // 사용량 정보 저장 (미들웨어에서 처리)
+    req.usageData = {
+      providerId: result.providerId,
+      providerName: result.provider,
+      modelName: result.model,
+      promptTokens: result.usage.promptTokens,
+      completionTokens: result.usage.completionTokens,
+      totalTokens: result.usage.totalTokens,
+      costUsd: result.cost,
+      responseTimeMs: responseTime,
+      success: true,
+    };
+
+    // OpenAI 호환 응답 형식
+    return res.json({
+      id: `chatcmpl-${Date.now()}`,
+      object: 'chat.completion',
+      created: Math.floor(Date.now() / 1000),
+      model: result.model,
+      choices: [
+        {
+          index: 0,
+          message: {
+            role: 'assistant',
+            content: result.text,
+          },
+          finish_reason: 'stop',
+        },
+      ],
+      usage: {
+        prompt_tokens: result.usage.promptTokens,
+        completion_tokens: result.usage.completionTokens,
+        total_tokens: result.usage.totalTokens,
+      },
+    });
+  } catch (error) {
+    logger.error('채팅 완성 오류:', error);
+
+    // 사용량 정보 저장 (실패)
+    req.usageData = {
+      success: false,
+      errorMessage: error.message,
+    };
+
+    return next(error);
+  }
+};
+
+/**
+ * 스트리밍 응답 처리
+ */
+async function handleStreamingResponse(req, res, params) {
+  const { model, messages, temperature, maxTokens } = params;
+
+  // SSE 헤더 설정
+  res.setHeader('Content-Type', 'text/event-stream');
+  res.setHeader('Cache-Control', 'no-cache');
+  res.setHeader('Connection', 'keep-alive');
+
+  try {
+    // 스트리밍 응답 생성
+    const stream = await llmService.chatStream({
+      model,
+      messages,
+      temperature,
+      maxTokens,
+      userId: req.user.id,
+      apiKeyId: req.apiKey?.id,
+    });
+
+    // 스트림 이벤트 처리
+    for await (const chunk of stream) {
+      const data = {
+        id: `chatcmpl-${Date.now()}`,
+        object: 'chat.completion.chunk',
+        created: Math.floor(Date.now() / 1000),
+        model,
+        choices: [
+          {
+            index: 0,
+            delta: {
+              content: chunk.text,
+            },
+            finish_reason: chunk.done ? 'stop' : null,
+          },
+        ],
+      };
+
+      res.write(`data: ${JSON.stringify(data)}\n\n`);
+    }
+
+    // 스트림 종료
+    res.write('data: [DONE]\n\n');
+    res.end();
+  } catch (error) {
+    logger.error('스트리밍 오류:', error);
+
+    const errorData = {
+      error: {
+        message: error.message,
+        type: 'server_error',
+      },
+    };
+
+    res.write(`data: ${JSON.stringify(errorData)}\n\n`);
+    res.end();
+  }
+}

ai-assistant/src/controllers/model.controller.js

@@ -0,0 +1,67 @@
+// src/controllers/model.controller.js
+// 모델 컨트롤러
+
+const { LLMProvider } = require('../models');
+
+/**
+ * 사용 가능한 모델 목록 조회
+ */
+exports.list = async (req, res, next) => {
+  try {
+    const providers = await LLMProvider.getActiveProviders();
+
+    // OpenAI 호환 형식으로 변환
+    const models = providers.map((provider) => ({
+      id: provider.modelName,
+      object: 'model',
+      created: Math.floor(new Date(provider.createdAt).getTime() / 1000),
+      owned_by: provider.name,
+      permission: [],
+      root: provider.modelName,
+      parent: null,
+    }));
+
+    return res.json({
+      object: 'list',
+      data: models,
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 모델 상세 정보 조회
+ */
+exports.get = async (req, res, next) => {
+  try {
+    const { id } = req.params;
+
+    const provider = await LLMProvider.findOne({
+      where: { modelName: id, isActive: true },
+    });
+
+    if (!provider) {
+      return res.status(404).json({
+        error: {
+          message: `모델 '${id}'을(를) 찾을 수 없습니다.`,
+          type: 'invalid_request_error',
+          param: 'model',
+          code: 'model_not_found',
+        },
+      });
+    }
+
+    return res.json({
+      id: provider.modelName,
+      object: 'model',
+      created: Math.floor(new Date(provider.createdAt).getTime() / 1000),
+      owned_by: provider.name,
+      permission: [],
+      root: provider.modelName,
+      parent: null,
+    });
+  } catch (error) {
+    return next(error);
+  }
+};

ai-assistant/src/controllers/usage.controller.js

@@ -0,0 +1,177 @@
+// src/controllers/usage.controller.js
+// 사용량 컨트롤러
+
+const { UsageLog, User } = require('../models');
+const { Op } = require('sequelize');
+
+/**
+ * 사용량 요약 조회
+ */
+exports.getSummary = async (req, res, next) => {
+  try {
+    const userId = req.user.userId;
+
+    // 사용자 정보 조회
+    const user = await User.findByPk(userId);
+    if (!user) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'USER_NOT_FOUND',
+          message: '사용자를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    // 이번 달 사용량
+    const now = new Date();
+    const monthlyUsage = await UsageLog.getMonthlyTotalByUser(
+      userId,
+      now.getFullYear(),
+      now.getMonth() + 1
+    );
+
+    // 오늘 사용량
+    const todayStart = new Date(now.getFullYear(), now.getMonth(), now.getDate());
+    const todayEnd = new Date(todayStart);
+    todayEnd.setDate(todayEnd.getDate() + 1);
+
+    const todayUsage = await UsageLog.findOne({
+      where: {
+        userId,
+        createdAt: {
+          [Op.between]: [todayStart, todayEnd],
+        },
+      },
+      attributes: [
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('total_tokens')), 'totalTokens'],
+        [UsageLog.sequelize.fn('SUM', UsageLog.sequelize.col('cost_usd')), 'totalCost'],
+        [UsageLog.sequelize.fn('COUNT', UsageLog.sequelize.col('id')), 'requestCount'],
+      ],
+      raw: true,
+    });
+
+    return res.json({
+      success: true,
+      data: {
+        plan: user.plan,
+        limit: {
+          monthly: user.monthlyTokenLimit,
+          remaining: Math.max(0, user.monthlyTokenLimit - monthlyUsage.totalTokens),
+        },
+        usage: {
+          today: {
+            tokens: parseInt(todayUsage?.totalTokens, 10) || 0,
+            cost: parseFloat(todayUsage?.totalCost) || 0,
+            requests: parseInt(todayUsage?.requestCount, 10) || 0,
+          },
+          monthly: monthlyUsage,
+        },
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 일별 사용량 조회
+ */
+exports.getDailyUsage = async (req, res, next) => {
+  try {
+    const userId = req.user.userId;
+    const { startDate, endDate } = req.query;
+
+    // 기본값: 최근 30일
+    const end = endDate ? new Date(endDate) : new Date();
+    const start = startDate ? new Date(startDate) : new Date(end);
+    if (!startDate) {
+      start.setDate(start.getDate() - 30);
+    }
+
+    const dailyUsage = await UsageLog.getDailyUsageByUser(userId, start, end);
+
+    return res.json({
+      success: true,
+      data: {
+        startDate: start.toISOString().split('T')[0],
+        endDate: end.toISOString().split('T')[0],
+        usage: dailyUsage,
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 월별 사용량 조회
+ */
+exports.getMonthlyUsage = async (req, res, next) => {
+  try {
+    const userId = req.user.userId;
+    const now = new Date();
+    const year = parseInt(req.query.year, 10) || now.getFullYear();
+    const month = parseInt(req.query.month, 10) || (now.getMonth() + 1);
+
+    const monthlyUsage = await UsageLog.getMonthlyTotalByUser(userId, year, month);
+
+    return res.json({
+      success: true,
+      data: {
+        year,
+        month,
+        usage: monthlyUsage,
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 사용량 로그 목록 조회
+ */
+exports.getLogs = async (req, res, next) => {
+  try {
+    const userId = req.user.userId;
+    const page = parseInt(req.query.page, 10) || 1;
+    const limit = parseInt(req.query.limit, 10) || 20;
+    const offset = (page - 1) * limit;
+
+    const { count, rows: logs } = await UsageLog.findAndCountAll({
+      where: { userId },
+      attributes: [
+        'id',
+        'providerName',
+        'modelName',
+        'promptTokens',
+        'completionTokens',
+        'totalTokens',
+        'costUsd',
+        'responseTimeMs',
+        'success',
+        'errorMessage',
+        'createdAt',
+      ],
+      order: [['createdAt', 'DESC']],
+      limit,
+      offset,
+    });
+
+    return res.json({
+      success: true,
+      data: {
+        logs,
+        pagination: {
+          total: count,
+          page,
+          limit,
+          totalPages: Math.ceil(count / limit),
+        },
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};

ai-assistant/src/controllers/user.controller.js

@@ -0,0 +1,113 @@
+// src/controllers/user.controller.js
+// 사용자 컨트롤러
+
+const { User, UsageLog } = require('../models');
+const logger = require('../config/logger.config');
+
+/**
+ * 내 정보 조회
+ */
+exports.getMe = async (req, res, next) => {
+  try {
+    const user = await User.findByPk(req.user.userId);
+    if (!user) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'USER_NOT_FOUND',
+          message: '사용자를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    // 이번 달 사용량 조회
+    const now = new Date();
+    const monthlyUsage = await UsageLog.getMonthlyTotalByUser(
+      user.id,
+      now.getFullYear(),
+      now.getMonth() + 1
+    );
+
+    return res.json({
+      success: true,
+      data: {
+        ...user.toSafeJSON(),
+        usage: {
+          monthly: monthlyUsage,
+          limit: user.monthlyTokenLimit,
+          remaining: Math.max(0, user.monthlyTokenLimit - monthlyUsage.totalTokens),
+        },
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 내 정보 수정
+ */
+exports.updateMe = async (req, res, next) => {
+  try {
+    const { name, password } = req.body;
+
+    const user = await User.findByPk(req.user.userId);
+    if (!user) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'USER_NOT_FOUND',
+          message: '사용자를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    // 업데이트할 필드만 설정
+    if (name) user.name = name;
+    if (password) user.password = password;
+
+    await user.save();
+
+    logger.info(`사용자 정보 수정: ${user.email}`);
+
+    return res.json({
+      success: true,
+      data: user.toSafeJSON(),
+    });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * 계정 삭제
+ */
+exports.deleteMe = async (req, res, next) => {
+  try {
+    const user = await User.findByPk(req.user.userId);
+    if (!user) {
+      return res.status(404).json({
+        success: false,
+        error: {
+          code: 'USER_NOT_FOUND',
+          message: '사용자를 찾을 수 없습니다.',
+        },
+      });
+    }
+
+    // 소프트 삭제 (상태 변경)
+    user.status = 'inactive';
+    await user.save();
+
+    logger.info(`사용자 계정 삭제: ${user.email}`);
+
+    return res.json({
+      success: true,
+      data: {
+        message: '계정이 삭제되었습니다.',
+      },
+    });
+  } catch (error) {
+    return next(error);
+  }
+};

ai-assistant/src/middlewares/auth.middleware.js

@@ -0,0 +1,257 @@
+// src/middlewares/auth.middleware.js
+// 인증 미들웨어
+
+const jwt = require('jsonwebtoken');
+const { ApiKey, User } = require('../models');
+const logger = require('../config/logger.config');
+
+const JWT_SECRET = process.env.JWT_SECRET || 'your-secret-key';
+
+/**
+ * JWT 토큰 인증 미들웨어
+ * Authorization: Bearer <JWT_TOKEN>
+ */
+exports.authenticateJWT = async (req, res, next) => {
+  try {
+    const authHeader = req.headers.authorization;
+
+    if (!authHeader || !authHeader.startsWith('Bearer ')) {
+      return res.status(401).json({
+        success: false,
+        error: {
+          code: 'UNAUTHORIZED',
+          message: '인증 토큰이 필요합니다.',
+        },
+      });
+    }
+
+    const token = authHeader.substring(7);
+
+    try {
+      const decoded = jwt.verify(token, JWT_SECRET);
+      req.user = decoded;
+      return next();
+    } catch (error) {
+      if (error.name === 'TokenExpiredError') {
+        return res.status(401).json({
+          success: false,
+          error: {
+            code: 'TOKEN_EXPIRED',
+            message: '토큰이 만료되었습니다.',
+          },
+        });
+      }
+
+      return res.status(401).json({
+        success: false,
+        error: {
+          code: 'INVALID_TOKEN',
+          message: '유효하지 않은 토큰입니다.',
+        },
+      });
+    }
+  } catch (error) {
+    return next(error);
+  }
+};
+
+/**
+ * API 키 인증 미들웨어
+ * Authorization: Bearer <API_KEY>
+ */
+exports.authenticateApiKey = async (req, res, next) => {
+  try {
+    const authHeader = req.headers.authorization;
+
+    if (!authHeader || !authHeader.startsWith('Bearer ')) {
+      return res.status(401).json({
+        error: {
+          message: 'API 키가 필요합니다.',
+          type: 'invalid_request_error',
+          code: 'missing_api_key',
+        },
+      });
+    }
+
+    const apiKeyValue = authHeader.substring(7);
+
+    // API 키 접두사 확인
+    const prefix = process.env.API_KEY_PREFIX || 'sk-';
+    if (!apiKeyValue.startsWith(prefix)) {
+      return res.status(401).json({
+        error: {
+          message: '유효하지 않은 API 키 형식입니다.',
+          type: 'invalid_request_error',
+          code: 'invalid_api_key',
+        },
+      });
+    }
+
+    // API 키 조회
+    const apiKey = await ApiKey.findByKey(apiKeyValue);
+
+    if (!apiKey) {
+      return res.status(401).json({
+        error: {
+          message: '유효하지 않은 API 키입니다.',
+          type: 'invalid_request_error',
+          code: 'invalid_api_key',
+        },
+      });
+    }
+
+    // 만료 확인
+    if (apiKey.isExpired()) {
+      return res.status(401).json({
+        error: {
+          message: 'API 키가 만료되었습니다.',
+          type: 'invalid_request_error',
+          code: 'expired_api_key',
+        },
+      });
+    }
+
+    // 사용자 상태 확인
+    if (apiKey.user.status !== 'active') {
+      return res.status(403).json({
+        error: {
+          message: '계정이 비활성화되었습니다.',
+          type: 'invalid_request_error',
+          code: 'account_inactive',
+        },
+      });
+    }
+
+    // 사용 기록 업데이트
+    await apiKey.recordUsage();
+
+    // 요청 객체에 사용자 및 API 키 정보 추가
+    req.user = {
+      id: apiKey.user.id,
+      userId: apiKey.user.id,
+      email: apiKey.user.email,
+      role: apiKey.user.role,
+      plan: apiKey.user.plan,
+    };
+    req.apiKey = apiKey;
+
+    return next();
+  } catch (error) {
+    logger.error('API 키 인증 오류:', error);
+    return next(error);
+  }
+};
+
+/**
+ * 관리자 권한 확인 미들웨어
+ */
+exports.requireAdmin = (req, res, next) => {
+  if (req.user.role !== 'admin') {
+    return res.status(403).json({
+      success: false,
+      error: {
+        code: 'FORBIDDEN',
+        message: '관리자 권한이 필요합니다.',
+      },
+    });
+  }
+  return next();
+};
+
+/**
+ * JWT 또는 API 키 인증 미들웨어
+ * JWT 토큰과 API 키 모두 허용
+ */
+exports.authenticateAny = async (req, res, next) => {
+  try {
+    const authHeader = req.headers.authorization;
+
+    if (!authHeader || !authHeader.startsWith('Bearer ')) {
+      return res.status(401).json({
+        success: false,
+        error: {
+          code: 'UNAUTHORIZED',
+          message: '인증이 필요합니다.',
+        },
+      });
+    }
+
+    const token = authHeader.substring(7);
+    const prefix = process.env.API_KEY_PREFIX || 'sk-';
+
+    // API 키인 경우
+    if (token.startsWith(prefix)) {
+      const apiKey = await ApiKey.findByKey(token);
+
+      if (!apiKey) {
+        return res.status(401).json({
+          error: {
+            message: '유효하지 않은 API 키입니다.',
+            type: 'invalid_request_error',
+            code: 'invalid_api_key',
+          },
+        });
+      }
+
+      if (apiKey.isExpired()) {
+        return res.status(401).json({
+          error: {
+            message: 'API 키가 만료되었습니다.',
+            type: 'invalid_request_error',
+            code: 'expired_api_key',
+          },
+        });
+      }
+
+      if (apiKey.user.status !== 'active') {
+        return res.status(403).json({
+          error: {
+            message: '계정이 비활성화되었습니다.',
+            type: 'invalid_request_error',
+            code: 'account_inactive',
+          },
+        });
+      }
+
+      await apiKey.recordUsage();
+
+      req.user = {
+        id: apiKey.user.id,
+        userId: apiKey.user.id,
+        email: apiKey.user.email,
+        role: apiKey.user.role,
+        plan: apiKey.user.plan,
+      };
+      req.apiKey = apiKey;
+
+      return next();
+    }
+
+    // JWT 토큰인 경우
+    try {
+      const decoded = jwt.verify(token, JWT_SECRET);
+      req.user = decoded;
+      return next();
+    } catch (error) {
+      if (error.name === 'TokenExpiredError') {
+        return res.status(401).json({
+          success: false,
+          error: {
+            code: 'TOKEN_EXPIRED',
+            message: '토큰이 만료되었습니다.',
+          },
+        });
+      }
+
+      return res.status(401).json({
+        success: false,
+        error: {
+          code: 'INVALID_TOKEN',
+          message: '유효하지 않은 토큰입니다.',
+        },
+      });
+    }
+  } catch (error) {
+    return next(error);
+  }
+};

ai-assistant/src/middlewares/error-handler.middleware.js

@@ -0,0 +1,80 @@
+// src/middlewares/error-handler.middleware.js
+// 에러 핸들러 미들웨어
+
+const logger = require('../config/logger.config');
+
+/**
+ * 전역 에러 핸들러
+ */
+module.exports = (err, req, res, _next) => {
+  // 에러 로깅
+  logger.error('에러 발생:', {
+    message: err.message,
+    stack: err.stack,
+    path: req.path,
+    method: req.method,
+  });
+
+  // Sequelize 유효성 검사 에러
+  if (err.name === 'SequelizeValidationError') {
+    return res.status(400).json({
+      success: false,
+      error: {
+        code: 'VALIDATION_ERROR',
+        message: '데이터 유효성 검사 실패',
+        details: err.errors.map((e) => ({
+          field: e.path,
+          message: e.message,
+        })),
+      },
+    });
+  }
+
+  // Sequelize 고유 제약 조건 에러
+  if (err.name === 'SequelizeUniqueConstraintError') {
+    return res.status(409).json({
+      success: false,
+      error: {
+        code: 'DUPLICATE_ENTRY',
+        message: '중복된 데이터가 존재합니다.',
+        details: err.errors.map((e) => ({
+          field: e.path,
+          message: e.message,
+        })),
+      },
+    });
+  }
+
+  // JWT 에러
+  if (err.name === 'JsonWebTokenError') {
+    return res.status(401).json({
+      success: false,
+      error: {
+        code: 'INVALID_TOKEN',
+        message: '유효하지 않은 토큰입니다.',
+      },
+    });
+  }
+
+  // 기본 에러 응답
+  const statusCode = err.statusCode || 500;
+  const message = err.message || '서버 오류가 발생했습니다.';
+
+  // 프로덕션 환경에서는 상세 에러 숨김
+  const response = {
+    success: false,
+    error: {
+      code: err.code || 'INTERNAL_ERROR',
+      message: process.env.NODE_ENV === 'production' && statusCode === 500
+        ? '서버 오류가 발생했습니다.'
+        : message,
+    },
+  };
+
+  // 개발 환경에서는 스택 트레이스 포함
+  if (process.env.NODE_ENV === 'development') {
+    response.error.stack = err.stack;
+  }
+
+  return res.status(statusCode).json(response);
+};

ai-assistant/src/middlewares/usage-logger.middleware.js

@@ -0,0 +1,50 @@
+// src/middlewares/usage-logger.middleware.js
+// 사용량 로깅 미들웨어
+
+const { UsageLog } = require('../models');
+const logger = require('../config/logger.config');
+
+/**
+ * 사용량 로깅 미들웨어
+ * 응답 완료 후 사용량 정보를 데이터베이스에 저장
+ */
+exports.usageLogger = (req, res, next) => {
+  // 응답 완료 후 처리
+  res.on('finish', async () => {
+    try {
+      // 사용량 데이터가 없으면 스킵
+      if (!req.usageData) {
+        return;
+      }
+
+      const usageData = {
+        userId: req.user?.id || req.user?.userId,
+        apiKeyId: req.apiKey?.id || null,
+        providerId: req.usageData.providerId || null,
+        providerName: req.usageData.providerName || null,
+        modelName: req.usageData.modelName || null,
+        promptTokens: req.usageData.promptTokens || 0,
+        completionTokens: req.usageData.completionTokens || 0,
+        totalTokens: req.usageData.totalTokens || 0,
+        costUsd: req.usageData.costUsd || 0,
+        responseTimeMs: req.usageData.responseTimeMs || null,
+        success: req.usageData.success !== false,
+        errorMessage: req.usageData.errorMessage || null,
+        requestIp: req.ip || req.connection?.remoteAddress,
+        userAgent: req.headers['user-agent'] || null,
+      };
+
+      await UsageLog.create(usageData);
+
+      logger.debug('사용량 로그 저장:', {
+        userId: usageData.userId,
+        tokens: usageData.totalTokens,
+        cost: usageData.costUsd,
+      });
+    } catch (error) {
+      logger.error('사용량 로그 저장 실패:', error);
+    }
+  });
+
+  next();
+};

ai-assistant/src/middlewares/validation.middleware.js

@@ -0,0 +1,30 @@
+// src/middlewares/validation.middleware.js
+// 유효성 검사 미들웨어
+
+const { validationResult } = require('express-validator');
+
+/**
+ * 요청 유효성 검사 결과 처리
+ */
+exports.validateRequest = (req, res, next) => {
+  const errors = validationResult(req);
+
+  if (!errors.isEmpty()) {
+    const formattedErrors = errors.array().map((error) => ({
+      field: error.path,
+      message: error.msg,
+      value: error.value,
+    }));
+
+    return res.status(400).json({
+      success: false,
+      error: {
+        code: 'VALIDATION_ERROR',
+        message: '입력값이 올바르지 않습니다.',
+        details: formattedErrors,
+      },
+    });
+  }
+
+  return next();
+};

ai-assistant/src/models/api-key.model.js

@@ -0,0 +1,130 @@
+// src/models/api-key.model.js
+// API 키 모델
+
+const { DataTypes } = require('sequelize');
+const crypto = require('crypto');
+
+module.exports = (sequelize) => {
+  const ApiKey = sequelize.define('ApiKey', {
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true,
+    },
+    userId: {
+      type: DataTypes.UUID,
+      allowNull: false,
+      references: {
+        model: 'users',
+        key: 'id',
+      },
+      comment: '소유자 사용자 ID',
+    },
+    name: {
+      type: DataTypes.STRING(100),
+      allowNull: false,
+      comment: 'API 키 이름 (사용자 지정)',
+    },
+    keyPrefix: {
+      type: DataTypes.STRING(12),
+      allowNull: false,
+      comment: 'API 키 접두사 (표시용)',
+    },
+    keyHash: {
+      type: DataTypes.STRING(64),
+      allowNull: false,
+      unique: true,
+      comment: 'API 키 해시 (SHA-256)',
+    },
+    permissions: {
+      type: DataTypes.JSONB,
+      defaultValue: ['chat:read', 'chat:write'],
+      comment: '권한 목록',
+    },
+    rateLimit: {
+      type: DataTypes.INTEGER,
+      defaultValue: 60, // 분당 60회
+      comment: '분당 요청 제한',
+    },
+    status: {
+      type: DataTypes.ENUM('active', 'revoked', 'expired'),
+      defaultValue: 'active',
+      comment: 'API 키 상태',
+    },
+    expiresAt: {
+      type: DataTypes.DATE,
+      allowNull: true,
+      comment: '만료 일시 (null이면 무기한)',
+    },
+    lastUsedAt: {
+      type: DataTypes.DATE,
+      allowNull: true,
+      comment: '마지막 사용 시간',
+    },
+    totalRequests: {
+      type: DataTypes.INTEGER,
+      defaultValue: 0,
+      comment: '총 요청 수',
+    },
+  }, {
+    tableName: 'api_keys',
+    timestamps: true,
+    underscored: true,
+    indexes: [
+      {
+        fields: ['key_hash'],
+        unique: true,
+      },
+      {
+        fields: ['user_id'],
+      },
+      {
+        fields: ['status'],
+      },
+    ],
+  });
+
+  // 클래스 메서드: API 키 생성
+  ApiKey.generateKey = function() {
+    const prefix = process.env.API_KEY_PREFIX || 'sk-';
+    const length = parseInt(process.env.API_KEY_LENGTH, 10) || 48;
+    const randomPart = crypto.randomBytes(length).toString('base64url').slice(0, length);
+    return `${prefix}${randomPart}`;
+  };
+
+  // 클래스 메서드: API 키 해시 생성
+  ApiKey.hashKey = function(key) {
+    return crypto.createHash('sha256').update(key).digest('hex');
+  };
+
+  // 클래스 메서드: API 키로 조회
+  ApiKey.findByKey = async function(key) {
+    const keyHash = this.hashKey(key);
+    const apiKey = await this.findOne({
+      where: { keyHash, status: 'active' },
+    });
+    
+    if (apiKey) {
+      // 사용자 정보 별도 조회
+      const { User } = require('./index');
+      apiKey.user = await User.findByPk(apiKey.userId);
+    }
+    
+    return apiKey;
+  };
+
+  // 인스턴스 메서드: 사용 기록 업데이트
+  ApiKey.prototype.recordUsage = async function() {
+    this.lastUsedAt = new Date();
+    this.totalRequests += 1;
+    await this.save();
+  };
+
+  // 인스턴스 메서드: 만료 여부 확인
+  ApiKey.prototype.isExpired = function() {
+    if (!this.expiresAt) return false;
+    return new Date() > this.expiresAt;
+  };
+
+  return ApiKey;
+};

ai-assistant/src/models/index.js

@@ -0,0 +1,55 @@
+// src/models/index.js
+// Sequelize 모델 인덱스
+
+const { Sequelize } = require('sequelize');
+const config = require('../config/database.config');
+
+const env = process.env.NODE_ENV || 'development';
+const dbConfig = config[env];
+
+// Sequelize 인스턴스 생성
+const sequelize = new Sequelize(
+  dbConfig.database,
+  dbConfig.username,
+  dbConfig.password,
+  {
+    host: dbConfig.host,
+    port: dbConfig.port,
+    dialect: dbConfig.dialect,
+    logging: dbConfig.logging,
+    pool: dbConfig.pool,
+    dialectOptions: dbConfig.dialectOptions,
+  }
+);
+
+// 모델 임포트
+const User = require('./user.model')(sequelize);
+const ApiKey = require('./api-key.model')(sequelize);
+const UsageLog = require('./usage-log.model')(sequelize);
+const LLMProvider = require('./llm-provider.model')(sequelize);
+
+// 관계 설정
+// User - ApiKey (1:N)
+User.hasMany(ApiKey, { foreignKey: 'userId', as: 'apiKeys' });
+ApiKey.belongsTo(User, { foreignKey: 'userId', as: 'user' });
+
+// User - UsageLog (1:N)
+User.hasMany(UsageLog, { foreignKey: 'userId', as: 'usageLogs' });
+UsageLog.belongsTo(User, { foreignKey: 'userId', as: 'user' });
+
+// ApiKey - UsageLog (1:N)
+ApiKey.hasMany(UsageLog, { foreignKey: 'apiKeyId', as: 'usageLogs' });
+UsageLog.belongsTo(ApiKey, { foreignKey: 'apiKeyId', as: 'apiKey' });
+
+// LLMProvider - UsageLog (1:N)
+LLMProvider.hasMany(UsageLog, { foreignKey: 'providerId', as: 'usageLogs' });
+UsageLog.belongsTo(LLMProvider, { foreignKey: 'providerId', as: 'provider' });
+
+module.exports = {
+  sequelize,
+  Sequelize,
+  User,
+  ApiKey,
+  UsageLog,
+  LLMProvider,
+};

ai-assistant/src/models/llm-provider.model.js

@@ -0,0 +1,143 @@
+// src/models/llm-provider.model.js
+// LLM 프로바이더 모델
+
+const { DataTypes } = require('sequelize');
+
+module.exports = (sequelize) => {
+  const LLMProvider = sequelize.define('LLMProvider', {
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true,
+    },
+    name: {
+      type: DataTypes.STRING(50),
+      allowNull: false,
+      unique: true,
+      comment: '프로바이더 이름 (gemini, openai, claude 등)',
+    },
+    displayName: {
+      type: DataTypes.STRING(100),
+      allowNull: false,
+      comment: '표시 이름',
+    },
+    endpoint: {
+      type: DataTypes.STRING(500),
+      allowNull: true,
+      comment: 'API 엔드포인트 URL',
+    },
+    apiKey: {
+      type: DataTypes.TEXT,
+      allowNull: true,
+      comment: 'API 키 (암호화 저장 권장)',
+    },
+    modelName: {
+      type: DataTypes.STRING(100),
+      allowNull: false,
+      comment: '기본 모델 이름',
+    },
+    priority: {
+      type: DataTypes.INTEGER,
+      defaultValue: 100,
+      comment: '우선순위 (낮을수록 우선)',
+    },
+    maxTokens: {
+      type: DataTypes.INTEGER,
+      defaultValue: 4096,
+      comment: '최대 토큰 수',
+    },
+    temperature: {
+      type: DataTypes.FLOAT,
+      defaultValue: 0.7,
+      comment: '기본 온도',
+    },
+    timeoutMs: {
+      type: DataTypes.INTEGER,
+      defaultValue: 60000,
+      comment: '타임아웃 (밀리초)',
+    },
+    costPer1kInputTokens: {
+      type: DataTypes.DECIMAL(10, 6),
+      defaultValue: 0,
+      comment: '입력 토큰 1K당 비용 (USD)',
+    },
+    costPer1kOutputTokens: {
+      type: DataTypes.DECIMAL(10, 6),
+      defaultValue: 0,
+      comment: '출력 토큰 1K당 비용 (USD)',
+    },
+    isActive: {
+      type: DataTypes.BOOLEAN,
+      defaultValue: true,
+      comment: '활성화 여부',
+    },
+    isHealthy: {
+      type: DataTypes.BOOLEAN,
+      defaultValue: true,
+      comment: '건강 상태',
+    },
+    lastHealthCheck: {
+      type: DataTypes.DATE,
+      allowNull: true,
+      comment: '마지막 헬스 체크 시간',
+    },
+    healthCheckUrl: {
+      type: DataTypes.STRING(500),
+      allowNull: true,
+      comment: '헬스 체크 URL',
+    },
+    config: {
+      type: DataTypes.JSONB,
+      defaultValue: {},
+      comment: '추가 설정',
+    },
+  }, {
+    tableName: 'llm_providers',
+    timestamps: true,
+    underscored: true,
+    indexes: [
+      {
+        fields: ['name'],
+        unique: true,
+      },
+      {
+        fields: ['priority'],
+      },
+      {
+        fields: ['is_active', 'is_healthy'],
+      },
+    ],
+  });
+
+  // 클래스 메서드: 활성 프로바이더 목록 조회 (우선순위 순)
+  LLMProvider.getActiveProviders = async function() {
+    return this.findAll({
+      where: { isActive: true },
+      order: [['priority', 'ASC']],
+    });
+  };
+
+  // 클래스 메서드: 건강한 프로바이더 목록 조회
+  LLMProvider.getHealthyProviders = async function() {
+    return this.findAll({
+      where: { isActive: true, isHealthy: true },
+      order: [['priority', 'ASC']],
+    });
+  };
+
+  // 인스턴스 메서드: 헬스 상태 업데이트
+  LLMProvider.prototype.updateHealth = async function(isHealthy) {
+    this.isHealthy = isHealthy;
+    this.lastHealthCheck = new Date();
+    await this.save();
+  };
+
+  // 인스턴스 메서드: 비용 계산
+  LLMProvider.prototype.calculateCost = function(promptTokens, completionTokens) {
+    const inputCost = (promptTokens / 1000) * parseFloat(this.costPer1kInputTokens || 0);
+    const outputCost = (completionTokens / 1000) * parseFloat(this.costPer1kOutputTokens || 0);
+    return inputCost + outputCost;
+  };
+
+  return LLMProvider;
+};

ai-assistant/src/models/usage-log.model.js

@@ -0,0 +1,164 @@
+// src/models/usage-log.model.js
+// 사용량 로그 모델
+
+const { DataTypes, Op } = require('sequelize');
+
+module.exports = (sequelize) => {
+  const UsageLog = sequelize.define('UsageLog', {
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true,
+    },
+    userId: {
+      type: DataTypes.UUID,
+      allowNull: false,
+      references: {
+        model: 'users',
+        key: 'id',
+      },
+      comment: '사용자 ID',
+    },
+    apiKeyId: {
+      type: DataTypes.UUID,
+      allowNull: true,
+      references: {
+        model: 'api_keys',
+        key: 'id',
+      },
+      comment: 'API 키 ID',
+    },
+    providerId: {
+      type: DataTypes.UUID,
+      allowNull: true,
+      references: {
+        model: 'llm_providers',
+        key: 'id',
+      },
+      comment: 'LLM 프로바이더 ID',
+    },
+    providerName: {
+      type: DataTypes.STRING(50),
+      allowNull: true,
+      comment: 'LLM 프로바이더 이름',
+    },
+    modelName: {
+      type: DataTypes.STRING(100),
+      allowNull: true,
+      comment: '사용된 모델 이름',
+    },
+    promptTokens: {
+      type: DataTypes.INTEGER,
+      defaultValue: 0,
+      comment: '프롬프트 토큰 수',
+    },
+    completionTokens: {
+      type: DataTypes.INTEGER,
+      defaultValue: 0,
+      comment: '완성 토큰 수',
+    },
+    totalTokens: {
+      type: DataTypes.INTEGER,
+      defaultValue: 0,
+      comment: '총 토큰 수',
+    },
+    costUsd: {
+      type: DataTypes.DECIMAL(10, 6),
+      defaultValue: 0,
+      comment: '비용 (USD)',
+    },
+    responseTimeMs: {
+      type: DataTypes.INTEGER,
+      allowNull: true,
+      comment: '응답 시간 (밀리초)',
+    },
+    success: {
+      type: DataTypes.BOOLEAN,
+      defaultValue: true,
+      comment: '성공 여부',
+    },
+    errorMessage: {
+      type: DataTypes.TEXT,
+      allowNull: true,
+      comment: '에러 메시지',
+    },
+    requestIp: {
+      type: DataTypes.STRING(45),
+      allowNull: true,
+      comment: '요청 IP 주소',
+    },
+    userAgent: {
+      type: DataTypes.STRING(500),
+      allowNull: true,
+      comment: 'User-Agent',
+    },
+  }, {
+    tableName: 'usage_logs',
+    timestamps: true,
+    underscored: true,
+    indexes: [
+      {
+        fields: ['user_id'],
+      },
+      {
+        fields: ['api_key_id'],
+      },
+      {
+        fields: ['created_at'],
+      },
+      {
+        fields: ['provider_name'],
+      },
+    ],
+  });
+
+  // 클래스 메서드: 사용자별 일별 사용량 조회
+  UsageLog.getDailyUsageByUser = async function(userId, startDate, endDate) {
+    return this.findAll({
+      where: {
+        userId,
+        createdAt: {
+          [Op.between]: [startDate, endDate],
+        },
+      },
+      attributes: [
+        [sequelize.fn('DATE', sequelize.col('created_at')), 'date'],
+        [sequelize.fn('SUM', sequelize.col('total_tokens')), 'totalTokens'],
+        [sequelize.fn('SUM', sequelize.col('cost_usd')), 'totalCost'],
+        [sequelize.fn('COUNT', sequelize.col('id')), 'requestCount'],
+      ],
+      group: [sequelize.fn('DATE', sequelize.col('created_at'))],
+      order: [[sequelize.fn('DATE', sequelize.col('created_at')), 'ASC']],
+      raw: true,
+    });
+  };
+
+  // 클래스 메서드: 사용자별 월간 총 사용량 조회
+  UsageLog.getMonthlyTotalByUser = async function(userId, year, month) {
+    const startDate = new Date(year, month - 1, 1);
+    const endDate = new Date(year, month, 0, 23, 59, 59);
+
+    const result = await this.findOne({
+      where: {
+        userId,
+        createdAt: {
+          [Op.between]: [startDate, endDate],
+        },
+      },
+      attributes: [
+        [sequelize.fn('SUM', sequelize.col('total_tokens')), 'totalTokens'],
+        [sequelize.fn('SUM', sequelize.col('cost_usd')), 'totalCost'],
+        [sequelize.fn('COUNT', sequelize.col('id')), 'requestCount'],
+      ],
+      raw: true,
+    });
+
+    return {
+      totalTokens: parseInt(result.totalTokens, 10) || 0,
+      totalCost: parseFloat(result.totalCost) || 0,
+      requestCount: parseInt(result.requestCount, 10) || 0,
+    };
+  };
+
+  return UsageLog;
+};

ai-assistant/src/models/user.model.js

@@ -0,0 +1,92 @@
+// src/models/user.model.js
+// 사용자 모델
+
+const { DataTypes } = require('sequelize');
+const bcrypt = require('bcryptjs');
+
+module.exports = (sequelize) => {
+  const User = sequelize.define('User', {
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true,
+    },
+    email: {
+      type: DataTypes.STRING(255),
+      allowNull: false,
+      unique: true,
+      validate: {
+        isEmail: true,
+      },
+      comment: '이메일 (로그인 ID)',
+    },
+    password: {
+      type: DataTypes.STRING(255),
+      allowNull: false,
+      comment: '비밀번호 (해시)',
+    },
+    name: {
+      type: DataTypes.STRING(100),
+      allowNull: false,
+      comment: '사용자 이름',
+    },
+    role: {
+      type: DataTypes.ENUM('user', 'admin'),
+      defaultValue: 'user',
+      comment: '역할 (user: 일반 사용자, admin: 관리자)',
+    },
+    status: {
+      type: DataTypes.ENUM('active', 'inactive', 'suspended'),
+      defaultValue: 'active',
+      comment: '계정 상태',
+    },
+    plan: {
+      type: DataTypes.ENUM('free', 'basic', 'pro', 'enterprise'),
+      defaultValue: 'free',
+      comment: '요금제 플랜',
+    },
+    monthlyTokenLimit: {
+      type: DataTypes.INTEGER,
+      defaultValue: 100000, // 무료 플랜 기본 10만 토큰
+      comment: '월간 토큰 한도',
+    },
+    lastLoginAt: {
+      type: DataTypes.DATE,
+      allowNull: true,
+      comment: '마지막 로그인 시간',
+    },
+  }, {
+    tableName: 'users',
+    timestamps: true,
+    underscored: true,
+    hooks: {
+      // 비밀번호 해싱
+      beforeCreate: async (user) => {
+        if (user.password) {
+          const salt = await bcrypt.genSalt(10);
+          user.password = await bcrypt.hash(user.password, salt);
+        }
+      },
+      beforeUpdate: async (user) => {
+        if (user.changed('password')) {
+          const salt = await bcrypt.genSalt(10);
+          user.password = await bcrypt.hash(user.password, salt);
+        }
+      },
+    },
+  });
+
+  // 인스턴스 메서드: 비밀번호 검증
+  User.prototype.validatePassword = async function(password) {
+    return bcrypt.compare(password, this.password);
+  };
+
+  // 인스턴스 메서드: 안전한 JSON 변환 (비밀번호 제외)
+  User.prototype.toSafeJSON = function() {
+    const values = { ...this.get() };
+    delete values.password;
+    return values;
+  };
+
+  return User;
+};

ai-assistant/src/routes/admin.routes.js

@@ -0,0 +1,151 @@
+// src/routes/admin.routes.js
+// 관리자 라우트
+
+const express = require('express');
+const { body, param } = require('express-validator');
+const adminController = require('../controllers/admin.controller');
+const { authenticateJWT, requireAdmin } = require('../middlewares/auth.middleware');
+const { validateRequest } = require('../middlewares/validation.middleware');
+
+const router = express.Router();
+
+// 모든 라우트에 JWT 인증 + 관리자 권한 필요
+router.use(authenticateJWT);
+router.use(requireAdmin);
+
+// ===== LLM 프로바이더 관리 =====
+
+/**
+ * GET /api/v1/admin/providers
+ * LLM 프로바이더 목록 조회
+ */
+router.get('/providers', adminController.getProviders);
+
+/**
+ * POST /api/v1/admin/providers
+ * LLM 프로바이더 추가
+ */
+router.post(
+  '/providers',
+  [
+    body('name')
+      .trim()
+      .isLength({ min: 1, max: 50 })
+      .withMessage('프로바이더 이름은 1-50자 사이여야 합니다'),
+    body('displayName')
+      .trim()
+      .isLength({ min: 1, max: 100 })
+      .withMessage('표시 이름은 1-100자 사이여야 합니다'),
+    body('modelName')
+      .trim()
+      .isLength({ min: 1, max: 100 })
+      .withMessage('모델 이름은 1-100자 사이여야 합니다'),
+    body('apiKey')
+      .optional()
+      .isString(),
+    body('priority')
+      .optional()
+      .isInt({ min: 1, max: 100 }),
+    validateRequest,
+  ],
+  adminController.createProvider
+);
+
+/**
+ * PATCH /api/v1/admin/providers/:id
+ * LLM 프로바이더 수정 (API 키 설정 포함)
+ */
+router.patch(
+  '/providers/:id',
+  [
+    param('id')
+      .isUUID()
+      .withMessage('유효한 프로바이더 ID가 아닙니다'),
+    body('apiKey')
+      .optional()
+      .isString(),
+    body('modelName')
+      .optional()
+      .isString(),
+    body('isActive')
+      .optional()
+      .isBoolean(),
+    body('priority')
+      .optional()
+      .isInt({ min: 1, max: 100 }),
+    validateRequest,
+  ],
+  adminController.updateProvider
+);
+
+/**
+ * DELETE /api/v1/admin/providers/:id
+ * LLM 프로바이더 삭제
+ */
+router.delete(
+  '/providers/:id',
+  [
+    param('id')
+      .isUUID()
+      .withMessage('유효한 프로바이더 ID가 아닙니다'),
+    validateRequest,
+  ],
+  adminController.deleteProvider
+);
+
+// ===== 사용자 관리 =====
+
+/**
+ * GET /api/v1/admin/users
+ * 사용자 목록 조회
+ */
+router.get('/users', adminController.getUsers);
+
+/**
+ * PATCH /api/v1/admin/users/:id
+ * 사용자 정보 수정 (역할, 상태, 플랜 등)
+ */
+router.patch(
+  '/users/:id',
+  [
+    param('id')
+      .isUUID()
+      .withMessage('유효한 사용자 ID가 아닙니다'),
+    body('role')
+      .optional()
+      .isIn(['user', 'admin']),
+    body('status')
+      .optional()
+      .isIn(['active', 'inactive', 'suspended']),
+    body('plan')
+      .optional()
+      .isIn(['free', 'basic', 'pro', 'enterprise']),
+    body('monthlyTokenLimit')
+      .optional()
+      .isInt({ min: 0 }),
+    validateRequest,
+  ],
+  adminController.updateUser
+);
+
+// ===== 시스템 통계 =====
+
+/**
+ * GET /api/v1/admin/stats
+ * 시스템 통계 조회
+ */
+router.get('/stats', adminController.getStats);
+
+/**
+ * GET /api/v1/admin/usage/by-user
+ * 사용자별 사용량 통계
+ */
+router.get('/usage/by-user', adminController.getUsageByUser);
+
+/**
+ * GET /api/v1/admin/usage/by-provider
+ * 프로바이더별 사용량 통계
+ */
+router.get('/usage/by-provider', adminController.getUsageByProvider);
+
+module.exports = router;

ai-assistant/src/routes/api-key.routes.js

@@ -0,0 +1,99 @@
+// src/routes/api-key.routes.js
+// API 키 라우트
+
+const express = require('express');
+const { body, param } = require('express-validator');
+const apiKeyController = require('../controllers/api-key.controller');
+const { authenticateJWT } = require('../middlewares/auth.middleware');
+const { validateRequest } = require('../middlewares/validation.middleware');
+
+const router = express.Router();
+
+// 모든 라우트에 JWT 인증 적용
+router.use(authenticateJWT);
+
+/**
+ * POST /api/v1/api-keys
+ * API 키 발급
+ */
+router.post(
+  '/',
+  [
+    body('name')
+      .trim()
+      .isLength({ min: 1, max: 100 })
+      .withMessage('API 키 이름은 1-100자 사이여야 합니다'),
+    body('expiresInDays')
+      .optional()
+      .isInt({ min: 1, max: 365 })
+      .withMessage('만료 기간은 1-365일 사이여야 합니다'),
+    body('permissions')
+      .optional()
+      .isArray()
+      .withMessage('권한은 배열이어야 합니다'),
+    validateRequest,
+  ],
+  apiKeyController.create
+);
+
+/**
+ * GET /api/v1/api-keys
+ * API 키 목록 조회
+ */
+router.get('/', apiKeyController.list);
+
+/**
+ * GET /api/v1/api-keys/:id
+ * API 키 상세 조회
+ */
+router.get(
+  '/:id',
+  [
+    param('id')
+      .isUUID()
+      .withMessage('유효한 API 키 ID가 아닙니다'),
+    validateRequest,
+  ],
+  apiKeyController.get
+);
+
+/**
+ * PATCH /api/v1/api-keys/:id
+ * API 키 수정
+ */
+router.patch(
+  '/:id',
+  [
+    param('id')
+      .isUUID()
+      .withMessage('유효한 API 키 ID가 아닙니다'),
+    body('name')
+      .optional()
+      .trim()
+      .isLength({ min: 1, max: 100 })
+      .withMessage('API 키 이름은 1-100자 사이여야 합니다'),
+    body('status')
+      .optional()
+      .isIn(['active', 'revoked'])
+      .withMessage('상태는 active 또는 revoked여야 합니다'),
+    validateRequest,
+  ],
+  apiKeyController.update
+);
+
+/**
+ * DELETE /api/v1/api-keys/:id
+ * API 키 폐기
+ */
+router.delete(
+  '/:id',
+  [
+    param('id')
+      .isUUID()
+      .withMessage('유효한 API 키 ID가 아닙니다'),
+    validateRequest,
+  ],
+  apiKeyController.revoke
+);
+
+module.exports = router;

ai-assistant/src/routes/auth.routes.js

@@ -0,0 +1,76 @@
+// src/routes/auth.routes.js
+// 인증 라우트
+
+const express = require('express');
+const { body } = require('express-validator');
+const authController = require('../controllers/auth.controller');
+const { validateRequest } = require('../middlewares/validation.middleware');
+
+const router = express.Router();
+
+/**
+ * POST /api/v1/auth/register
+ * 회원가입
+ */
+router.post(
+  '/register',
+  [
+    body('email')
+      .isEmail()
+      .normalizeEmail()
+      .withMessage('유효한 이메일 주소를 입력해주세요'),
+    body('password')
+      .isLength({ min: 8 })
+      .withMessage('비밀번호는 최소 8자 이상이어야 합니다')
+      .matches(/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)/)
+      .withMessage('비밀번호는 대문자, 소문자, 숫자를 포함해야 합니다'),
+    body('name')
+      .trim()
+      .isLength({ min: 2, max: 100 })
+      .withMessage('이름은 2-100자 사이여야 합니다'),
+    validateRequest,
+  ],
+  authController.register
+);
+
+/**
+ * POST /api/v1/auth/login
+ * 로그인
+ */
+router.post(
+  '/login',
+  [
+    body('email')
+      .isEmail()
+      .normalizeEmail()
+      .withMessage('유효한 이메일 주소를 입력해주세요'),
+    body('password')
+      .notEmpty()
+      .withMessage('비밀번호를 입력해주세요'),
+    validateRequest,
+  ],
+  authController.login
+);
+
+/**
+ * POST /api/v1/auth/refresh
+ * 토큰 갱신
+ */
+router.post(
+  '/refresh',
+  [
+    body('refreshToken')
+      .notEmpty()
+      .withMessage('리프레시 토큰을 입력해주세요'),
+    validateRequest,
+  ],
+  authController.refresh
+);
+
+/**
+ * POST /api/v1/auth/logout
+ * 로그아웃
+ */
+router.post('/logout', authController.logout);
+
+module.exports = router;

ai-assistant/src/routes/chat.routes.js

@@ -0,0 +1,55 @@
+// src/routes/chat.routes.js
+// 채팅 API 라우트 (OpenAI 호환)
+
+const express = require('express');
+const { body } = require('express-validator');
+const chatController = require('../controllers/chat.controller');
+const { authenticateAny } = require('../middlewares/auth.middleware');
+const { validateRequest } = require('../middlewares/validation.middleware');
+const { usageLogger } = require('../middlewares/usage-logger.middleware');
+
+const router = express.Router();
+
+/**
+ * POST /api/v1/chat/completions
+ * 채팅 완성 API (OpenAI 호환)
+ * 
+ * 인증: Bearer API_KEY 또는 JWT 토큰
+ */
+router.post(
+  '/completions',
+  authenticateAny,
+  [
+    body('model')
+      .optional()
+      .isString()
+      .withMessage('모델은 문자열이어야 합니다'),
+    body('messages')
+      .isArray({ min: 1 })
+      .withMessage('메시지 배열이 필요합니다'),
+    body('messages.*.role')
+      .isIn(['system', 'user', 'assistant'])
+      .withMessage('메시지 역할은 system, user, assistant 중 하나여야 합니다'),
+    body('messages.*.content')
+      .isString()
+      .notEmpty()
+      .withMessage('메시지 내용이 필요합니다'),
+    body('temperature')
+      .optional()
+      .isFloat({ min: 0, max: 2 })
+      .withMessage('온도는 0-2 사이여야 합니다'),
+    body('max_tokens')
+      .optional()
+      .isInt({ min: 1, max: 128000 })
+      .withMessage('최대 토큰은 1-128000 사이여야 합니다'),
+    body('stream')
+      .optional()
+      .isBoolean()
+      .withMessage('스트림은 불리언이어야 합니다'),
+    validateRequest,
+  ],
+  usageLogger,
+  chatController.completions
+);
+
+module.exports = router;

ai-assistant/src/routes/index.js

@@ -0,0 +1,45 @@
+// src/routes/index.js
+// API 라우트 인덱스
+
+const express = require('express');
+const authRoutes = require('./auth.routes');
+const userRoutes = require('./user.routes');
+const apiKeyRoutes = require('./api-key.routes');
+const chatRoutes = require('./chat.routes');
+const usageRoutes = require('./usage.routes');
+const modelRoutes = require('./model.routes');
+const adminRoutes = require('./admin.routes');
+
+const router = express.Router();
+
+// API 정보
+router.get('/', (req, res) => {
+  res.json({
+    success: true,
+    data: {
+      name: 'AI Assistant API',
+      version: '1.0.0',
+      description: 'LLM API Platform - OpenAI 호환 API',
+      endpoints: {
+        auth: '/api/v1/auth',
+        users: '/api/v1/users',
+        apiKeys: '/api/v1/api-keys',
+        chat: '/api/v1/chat',
+        models: '/api/v1/models',
+        usage: '/api/v1/usage',
+      },
+      documentation: 'https://docs.example.com',
+    },
+  });
+});
+
+// 라우트 등록
+router.use('/auth', authRoutes);
+router.use('/users', userRoutes);
+router.use('/api-keys', apiKeyRoutes);
+router.use('/chat', chatRoutes);
+router.use('/models', modelRoutes);
+router.use('/usage', usageRoutes);
+router.use('/admin', adminRoutes);
+
+module.exports = router;

ai-assistant/src/routes/model.routes.js

@@ -0,0 +1,24 @@
+// src/routes/model.routes.js
+// 모델 라우트
+
+const express = require('express');
+const modelController = require('../controllers/model.controller');
+const { authenticateAny } = require('../middlewares/auth.middleware');
+
+const router = express.Router();
+
+/**
+ * GET /api/v1/models
+ * 사용 가능한 모델 목록 조회
+ * JWT 토큰 또는 API 키로 인증
+ */
+router.get('/', authenticateAny, modelController.list);
+
+/**
+ * GET /api/v1/models/:id
+ * 모델 상세 정보 조회
+ * JWT 토큰 또는 API 키로 인증
+ */
+router.get('/:id', authenticateAny, modelController.get);
+
+module.exports = router;

ai-assistant/src/routes/usage.routes.js

@@ -0,0 +1,81 @@
+// src/routes/usage.routes.js
+// 사용량 라우트
+
+const express = require('express');
+const { query } = require('express-validator');
+const usageController = require('../controllers/usage.controller');
+const { authenticateJWT } = require('../middlewares/auth.middleware');
+const { validateRequest } = require('../middlewares/validation.middleware');
+
+const router = express.Router();
+
+// 모든 라우트에 JWT 인증 적용
+router.use(authenticateJWT);
+
+/**
+ * GET /api/v1/usage
+ * 사용량 요약 조회
+ */
+router.get('/', usageController.getSummary);
+
+/**
+ * GET /api/v1/usage/daily
+ * 일별 사용량 조회
+ */
+router.get(
+  '/daily',
+  [
+    query('startDate')
+      .optional()
+      .isISO8601()
+      .withMessage('시작 날짜는 ISO 8601 형식이어야 합니다'),
+    query('endDate')
+      .optional()
+      .isISO8601()
+      .withMessage('종료 날짜는 ISO 8601 형식이어야 합니다'),
+    validateRequest,
+  ],
+  usageController.getDailyUsage
+);
+
+/**
+ * GET /api/v1/usage/monthly
+ * 월별 사용량 조회
+ */
+router.get(
+  '/monthly',
+  [
+    query('year')
+      .optional()
+      .isInt({ min: 2020, max: 2100 })
+      .withMessage('연도는 2020-2100 사이여야 합니다'),
+    query('month')
+      .optional()
+      .isInt({ min: 1, max: 12 })
+      .withMessage('월은 1-12 사이여야 합니다'),
+    validateRequest,
+  ],
+  usageController.getMonthlyUsage
+);
+
+/**
+ * GET /api/v1/usage/logs
+ * 사용량 로그 목록 조회
+ */
+router.get(
+  '/logs',
+  [
+    query('page')
+      .optional()
+      .isInt({ min: 1 })
+      .withMessage('페이지는 1 이상이어야 합니다'),
+    query('limit')
+      .optional()
+      .isInt({ min: 1, max: 100 })
+      .withMessage('한도는 1-100 사이여야 합니다'),
+    validateRequest,
+  ],
+  usageController.getLogs
+);
+
+module.exports = router;

ai-assistant/src/routes/user.routes.js

@@ -0,0 +1,50 @@
+// src/routes/user.routes.js
+// 사용자 라우트
+
+const express = require('express');
+const { body } = require('express-validator');
+const userController = require('../controllers/user.controller');
+const { authenticateJWT } = require('../middlewares/auth.middleware');
+const { validateRequest } = require('../middlewares/validation.middleware');
+
+const router = express.Router();
+
+// 모든 라우트에 JWT 인증 적용
+router.use(authenticateJWT);
+
+/**
+ * GET /api/v1/users/me
+ * 내 정보 조회
+ */
+router.get('/me', userController.getMe);
+
+/**
+ * PATCH /api/v1/users/me
+ * 내 정보 수정
+ */
+router.patch(
+  '/me',
+  [
+    body('name')
+      .optional()
+      .trim()
+      .isLength({ min: 2, max: 100 })
+      .withMessage('이름은 2-100자 사이여야 합니다'),
+    body('password')
+      .optional()
+      .isLength({ min: 8 })
+      .withMessage('비밀번호는 최소 8자 이상이어야 합니다')
+      .matches(/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)/)
+      .withMessage('비밀번호는 대문자, 소문자, 숫자를 포함해야 합니다'),
+    validateRequest,
+  ],
+  userController.updateMe
+);
+
+/**
+ * DELETE /api/v1/users/me
+ * 계정 삭제
+ */
+router.delete('/me', userController.deleteMe);
+
+module.exports = router;

ai-assistant/src/seeders/001-llm-providers.js

@@ -0,0 +1,74 @@
+// src/seeders/001-llm-providers.js
+// LLM 프로바이더 시드 데이터
+
+const { v4: uuidv4 } = require('uuid');
+
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+    const now = new Date();
+
+    await queryInterface.bulkInsert('llm_providers', [
+      {
+        id: uuidv4(),
+        name: 'gemini',
+        display_name: 'Google Gemini',
+        endpoint: null, // SDK 사용
+        api_key: process.env.GEMINI_API_KEY || '',
+        model_name: 'gemini-2.0-flash',
+        priority: 1,
+        max_tokens: 8192,
+        temperature: 0.7,
+        timeout_ms: 60000,
+        cost_per_1k_input_tokens: 0.00025,
+        cost_per_1k_output_tokens: 0.001,
+        is_active: true,
+        is_healthy: true,
+        config: JSON.stringify({}),
+        created_at: now,
+        updated_at: now,
+      },
+      {
+        id: uuidv4(),
+        name: 'openai',
+        display_name: 'OpenAI GPT',
+        endpoint: 'https://api.openai.com/v1/chat/completions',
+        api_key: process.env.OPENAI_API_KEY || '',
+        model_name: 'gpt-4o-mini',
+        priority: 2,
+        max_tokens: 4096,
+        temperature: 0.7,
+        timeout_ms: 60000,
+        cost_per_1k_input_tokens: 0.00015,
+        cost_per_1k_output_tokens: 0.0006,
+        is_active: true,
+        is_healthy: true,
+        config: JSON.stringify({}),
+        created_at: now,
+        updated_at: now,
+      },
+      {
+        id: uuidv4(),
+        name: 'claude',
+        display_name: 'Anthropic Claude',
+        endpoint: 'https://api.anthropic.com/v1/messages',
+        api_key: process.env.CLAUDE_API_KEY || '',
+        model_name: 'claude-3-haiku-20240307',
+        priority: 3,
+        max_tokens: 4096,
+        temperature: 0.7,
+        timeout_ms: 60000,
+        cost_per_1k_input_tokens: 0.00025,
+        cost_per_1k_output_tokens: 0.00125,
+        is_active: true,
+        is_healthy: true,
+        config: JSON.stringify({}),
+        created_at: now,
+        updated_at: now,
+      },
+    ]);
+  },
+
+  down: async (queryInterface, Sequelize) => {
+    await queryInterface.bulkDelete('llm_providers', null, {});
+  },
+};

ai-assistant/src/services/init.service.js

@@ -0,0 +1,128 @@
+// src/services/init.service.js
+// 초기 데이터 설정 서비스
+
+const { User, LLMProvider } = require('../models');
+const logger = require('../config/logger.config');
+
+/**
+ * 초기 관리자 계정 생성
+ */
+async function createDefaultAdmin() {
+  try {
+    const adminEmail = process.env.ADMIN_EMAIL || 'admin@admin.com';
+    const adminPassword = process.env.ADMIN_PASSWORD || 'Admin123!';
+    
+    const existing = await User.findOne({ where: { email: adminEmail } });
+    if (existing) {
+      logger.info(`관리자 계정 이미 존재: ${adminEmail}`);
+      return existing;
+    }
+
+    const admin = await User.create({
+      email: adminEmail,
+      password: adminPassword,
+      name: '관리자',
+      role: 'admin',
+      status: 'active',
+      plan: 'enterprise',
+      monthlyTokenLimit: 10000000, // 1000만 토큰
+    });
+
+    logger.info(`✅ 기본 관리자 계정 생성: ${adminEmail}`);
+    return admin;
+  } catch (error) {
+    logger.error('관리자 계정 생성 실패:', error);
+    throw error;
+  }
+}
+
+/**
+ * 기본 LLM 프로바이더 생성
+ */
+async function createDefaultProviders() {
+  try {
+    const providers = [
+      {
+        name: 'gemini',
+        displayName: 'Google Gemini',
+        endpoint: null,
+        apiKey: process.env.GEMINI_API_KEY || '',
+        modelName: process.env.GEMINI_MODEL || 'gemini-2.0-flash',
+        priority: 1,
+        maxTokens: 8192,
+        temperature: 0.7,
+        timeoutMs: 60000,
+        costPer1kInputTokens: 0.00025,
+        costPer1kOutputTokens: 0.001,
+      },
+      {
+        name: 'openai',
+        displayName: 'OpenAI GPT',
+        endpoint: 'https://api.openai.com/v1/chat/completions',
+        apiKey: process.env.OPENAI_API_KEY || '',
+        modelName: process.env.OPENAI_MODEL || 'gpt-4o-mini',
+        priority: 2,
+        maxTokens: 4096,
+        temperature: 0.7,
+        timeoutMs: 60000,
+        costPer1kInputTokens: 0.00015,
+        costPer1kOutputTokens: 0.0006,
+      },
+      {
+        name: 'claude',
+        displayName: 'Anthropic Claude',
+        endpoint: 'https://api.anthropic.com/v1/messages',
+        apiKey: process.env.CLAUDE_API_KEY || '',
+        modelName: process.env.CLAUDE_MODEL || 'claude-3-haiku-20240307',
+        priority: 3,
+        maxTokens: 4096,
+        temperature: 0.7,
+        timeoutMs: 60000,
+        costPer1kInputTokens: 0.00025,
+        costPer1kOutputTokens: 0.00125,
+      },
+    ];
+
+    for (const providerData of providers) {
+      const existing = await LLMProvider.findOne({ where: { name: providerData.name } });
+      if (existing) {
+        // API 키가 환경변수에 설정되어 있고 DB에는 없으면 업데이트
+        if (providerData.apiKey && !existing.apiKey) {
+          existing.apiKey = providerData.apiKey;
+          existing.modelName = providerData.modelName;
+          await existing.save();
+          logger.info(`LLM 프로바이더 API 키 업데이트: ${providerData.name}`);
+        }
+        continue;
+      }
+
+      await LLMProvider.create({
+        ...providerData,
+        isActive: true,
+        isHealthy: !!providerData.apiKey, // API 키가 있으면 healthy
+      });
+      logger.info(`✅ LLM 프로바이더 생성: ${providerData.name} (${providerData.modelName})`);
+    }
+  } catch (error) {
+    logger.error('LLM 프로바이더 생성 실패:', error);
+    throw error;
+  }
+}
+
+/**
+ * 초기화 실행
+ */
+async function initialize() {
+  logger.info('🔧 초기 데이터 설정 시작...');
+  
+  await createDefaultAdmin();
+  await createDefaultProviders();
+  
+  logger.info('✅ 초기 데이터 설정 완료');
+}
+
+module.exports = {
+  initialize,
+  createDefaultAdmin,
+  createDefaultProviders,
+};

ai-assistant/src/services/llm.service.js

@@ -0,0 +1,385 @@
+// src/services/llm.service.js
+// LLM 서비스 - 멀티 프로바이더 지원
+
+const axios = require('axios');
+const { LLMProvider } = require('../models');
+const logger = require('../config/logger.config');
+
+class LLMService {
+  constructor() {
+    this.providers = [];
+    this.initialized = false;
+  }
+
+  /**
+   * 서비스 초기화
+   */
+  async initialize() {
+    if (this.initialized) return;
+
+    try {
+      await this.loadProviders();
+      this.initialized = true;
+      logger.info('✅ LLM 서비스 초기화 완료');
+    } catch (error) {
+      logger.error('❌ LLM 서비스 초기화 실패:', error);
+      // 초기화 실패 시 기본 프로바이더 사용
+      this.providers = this.getDefaultProviders();
+      this.initialized = true;
+    }
+  }
+
+  /**
+   * 데이터베이스에서 프로바이더 로드
+   */
+  async loadProviders() {
+    try {
+      const providers = await LLMProvider.getHealthyProviders();
+      
+      if (providers.length === 0) {
+        logger.warn('⚠️ 활성 프로바이더가 없습니다. 기본 프로바이더 사용');
+        this.providers = this.getDefaultProviders();
+      } else {
+        this.providers = providers.map((p) => ({
+          id: p.id,
+          name: p.name,
+          endpoint: p.endpoint,
+          apiKey: p.apiKey,
+          modelName: p.modelName,
+          priority: p.priority,
+          maxTokens: p.maxTokens,
+          temperature: p.temperature,
+          timeoutMs: p.timeoutMs,
+          costPer1kInputTokens: parseFloat(p.costPer1kInputTokens) || 0,
+          costPer1kOutputTokens: parseFloat(p.costPer1kOutputTokens) || 0,
+          isHealthy: p.isHealthy,
+          config: p.config,
+        }));
+      }
+
+      logger.info(`📥 ${this.providers.length}개 프로바이더 로드됨`);
+    } catch (error) {
+      logger.error('프로바이더 로드 실패:', error);
+      throw error;
+    }
+  }
+
+  /**
+   * 기본 프로바이더 설정 (환경 변수 기반)
+   */
+  getDefaultProviders() {
+    const providers = [];
+
+    // Gemini
+    if (process.env.GEMINI_API_KEY) {
+      providers.push({
+        id: 'default-gemini',
+        name: 'gemini',
+        apiKey: process.env.GEMINI_API_KEY,
+        modelName: process.env.GEMINI_MODEL || 'gemini-2.0-flash',
+        priority: 1,
+        maxTokens: 8192,
+        temperature: 0.7,
+        timeoutMs: 60000,
+        costPer1kInputTokens: 0.00025,
+        costPer1kOutputTokens: 0.001,
+        isHealthy: true,
+      });
+    }
+
+    // OpenAI
+    if (process.env.OPENAI_API_KEY) {
+      providers.push({
+        id: 'default-openai',
+        name: 'openai',
+        endpoint: 'https://api.openai.com/v1/chat/completions',
+        apiKey: process.env.OPENAI_API_KEY,
+        modelName: process.env.OPENAI_MODEL || 'gpt-4o-mini',
+        priority: 2,
+        maxTokens: 4096,
+        temperature: 0.7,
+        timeoutMs: 60000,
+        costPer1kInputTokens: 0.00015,
+        costPer1kOutputTokens: 0.0006,
+        isHealthy: true,
+      });
+    }
+
+    // Claude
+    if (process.env.CLAUDE_API_KEY) {
+      providers.push({
+        id: 'default-claude',
+        name: 'claude',
+        endpoint: 'https://api.anthropic.com/v1/messages',
+        apiKey: process.env.CLAUDE_API_KEY,
+        modelName: process.env.CLAUDE_MODEL || 'claude-3-haiku-20240307',
+        priority: 3,
+        maxTokens: 4096,
+        temperature: 0.7,
+        timeoutMs: 60000,
+        costPer1kInputTokens: 0.00025,
+        costPer1kOutputTokens: 0.00125,
+        isHealthy: true,
+      });
+    }
+
+    return providers;
+  }
+
+  /**
+   * 채팅 API 호출 (자동 fallback)
+   */
+  async chat(params) {
+    const {
+      model,
+      messages,
+      temperature = 0.7,
+      maxTokens = 4096,
+      userId,
+      apiKeyId,
+    } = params;
+
+    // 초기화 확인
+    if (!this.initialized) {
+      await this.initialize();
+    }
+
+    const startTime = Date.now();
+    let lastError = null;
+
+    // 요청된 모델에 맞는 프로바이더 찾기
+    const requestedProvider = this.providers.find(
+      (p) => p.modelName === model || p.name === model
+    );
+
+    // 우선순위 순으로 프로바이더 정렬
+    const sortedProviders = requestedProvider
+      ? [requestedProvider, ...this.providers.filter((p) => p !== requestedProvider)]
+      : this.providers;
+
+    // 프로바이더 순회 (fallback)
+    for (const provider of sortedProviders) {
+      if (!provider.isHealthy) {
+        logger.warn(`⚠️ ${provider.name} 건강하지 않음, 건너뜀`);
+        continue;
+      }
+
+      try {
+        logger.info(`🚀 ${provider.name} (${provider.modelName}) 시도 중...`);
+
+        const result = await this.callProvider(provider, {
+          messages,
+          maxTokens: maxTokens || provider.maxTokens,
+          temperature: temperature || provider.temperature,
+        });
+
+        const responseTime = Date.now() - startTime;
+
+        // 비용 계산
+        const cost = this.calculateCost(
+          result.usage.promptTokens,
+          result.usage.completionTokens,
+          provider.costPer1kInputTokens,
+          provider.costPer1kOutputTokens
+        );
+
+        logger.info(
+          `✅ ${provider.name} 성공 (${responseTime}ms, ${result.usage.totalTokens} tokens)`
+        );
+
+        return {
+          text: result.text,
+          provider: provider.name,
+          providerId: provider.id,
+          model: provider.modelName,
+          usage: result.usage,
+          responseTime,
+          cost,
+        };
+      } catch (error) {
+        logger.error(`❌ ${provider.name} 실패:`, error.message);
+        lastError = error;
+
+        // 다음 프로바이더로 fallback
+        continue;
+      }
+    }
+
+    // 모든 프로바이더 실패
+    throw new Error(
+      `모든 LLM 프로바이더가 실패했습니다: ${lastError?.message || '알 수 없는 오류'}`
+    );
+  }
+
+  /**
+   * 개별 프로바이더 호출
+   */
+  async callProvider(provider, { messages, maxTokens, temperature }) {
+    const timeout = provider.timeoutMs || 60000;
+
+    switch (provider.name) {
+      case 'gemini':
+        return this.callGemini(provider, { messages, maxTokens, temperature });
+      case 'openai':
+        return this.callOpenAI(provider, { messages, maxTokens, temperature, timeout });
+      case 'claude':
+        return this.callClaude(provider, { messages, maxTokens, temperature, timeout });
+      default:
+        throw new Error(`지원하지 않는 프로바이더: ${provider.name}`);
+    }
+  }
+
+  /**
+   * Gemini API 호출
+   */
+  async callGemini(provider, { messages, maxTokens, temperature }) {
+    const { GoogleGenAI } = require('@google/genai');
+    
+    const ai = new GoogleGenAI({ apiKey: provider.apiKey });
+
+    // 메시지 변환 (OpenAI 형식 -> Gemini 형식)
+    const contents = messages.map((msg) => ({
+      role: msg.role === 'assistant' ? 'model' : 'user',
+      parts: [{ text: msg.content }],
+    }));
+
+    // system 메시지 처리
+    const systemMessage = messages.find((m) => m.role === 'system');
+    const systemInstruction = systemMessage ? systemMessage.content : undefined;
+
+    const config = {
+      maxOutputTokens: maxTokens,
+      temperature,
+    };
+
+    const result = await ai.models.generateContent({
+      model: provider.modelName,
+      contents: contents.filter((c) => c.role !== 'system'),
+      systemInstruction,
+      config,
+    });
+
+    // 응답 텍스트 추출
+    let text = '';
+    if (result.candidates?.[0]?.content?.parts) {
+      text = result.candidates[0].content.parts
+        .filter((p) => p.text)
+        .map((p) => p.text)
+        .join('\n');
+    }
+
+    const usage = result.usageMetadata || {};
+    const promptTokens = usage.promptTokenCount ?? 0;
+    const completionTokens = usage.candidatesTokenCount ?? 0;
+
+    return {
+      text,
+      usage: {
+        promptTokens,
+        completionTokens,
+        totalTokens: promptTokens + completionTokens,
+      },
+    };
+  }
+
+  /**
+   * OpenAI API 호출
+   */
+  async callOpenAI(provider, { messages, maxTokens, temperature, timeout }) {
+    const response = await axios.post(
+      provider.endpoint,
+      {
+        model: provider.modelName,
+        messages,
+        max_tokens: maxTokens,
+        temperature,
+      },
+      {
+        timeout,
+        headers: {
+          'Content-Type': 'application/json',
+          Authorization: `Bearer ${provider.apiKey}`,
+        },
+      }
+    );
+
+    return {
+      text: response.data.choices[0].message.content,
+      usage: {
+        promptTokens: response.data.usage.prompt_tokens,
+        completionTokens: response.data.usage.completion_tokens,
+        totalTokens: response.data.usage.total_tokens,
+      },
+    };
+  }
+
+  /**
+   * Claude API 호출
+   */
+  async callClaude(provider, { messages, maxTokens, temperature, timeout }) {
+    // system 메시지 분리
+    const systemMessage = messages.find((m) => m.role === 'system');
+    const otherMessages = messages.filter((m) => m.role !== 'system');
+
+    const response = await axios.post(
+      provider.endpoint,
+      {
+        model: provider.modelName,
+        messages: otherMessages,
+        system: systemMessage?.content,
+        max_tokens: maxTokens,
+        temperature,
+      },
+      {
+        timeout,
+        headers: {
+          'Content-Type': 'application/json',
+          'x-api-key': provider.apiKey,
+          'anthropic-version': '2023-06-01',
+        },
+      }
+    );
+
+    return {
+      text: response.data.content[0].text,
+      usage: {
+        promptTokens: response.data.usage.input_tokens,
+        completionTokens: response.data.usage.output_tokens,
+        totalTokens:
+          response.data.usage.input_tokens + response.data.usage.output_tokens,
+      },
+    };
+  }
+
+  /**
+   * 스트리밍 채팅 (제너레이터)
+   */
+  async *chatStream(params) {
+    // 현재는 간단한 구현 (전체 응답 후 청크로 분할)
+    // 실제 스트리밍은 각 프로바이더의 스트리밍 API 사용 필요
+    const result = await this.chat(params);
+    
+    // 텍스트를 청크로 분할하여 전송
+    const chunkSize = 10;
+    for (let i = 0; i < result.text.length; i += chunkSize) {
+      yield {
+        text: result.text.slice(i, i + chunkSize),
+        done: i + chunkSize >= result.text.length,
+      };
+    }
+  }
+
+  /**
+   * 비용 계산
+   */
+  calculateCost(promptTokens, completionTokens, inputCost, outputCost) {
+    const inputTotal = (promptTokens / 1000) * inputCost;
+    const outputTotal = (completionTokens / 1000) * outputCost;
+    return parseFloat((inputTotal + outputTotal).toFixed(6));
+  }
+}
+
+// 싱글톤 인스턴스
+const llmService = new LLMService();
+
+module.exports = llmService;

ai-assistant/src/swagger/api-docs.js

@@ -0,0 +1,359 @@
+// src/swagger/api-docs.js
+// Swagger API 문서 정의
+
+/**
+ * @swagger
+ * /auth/register:
+ *   post:
+ *     tags: [Auth]
+ *     summary: 회원가입
+ *     description: 새 계정을 생성합니다.
+ *     requestBody:
+ *       required: true
+ *       content:
+ *         application/json:
+ *           schema:
+ *             type: object
+ *             required: [email, password, name]
+ *             properties:
+ *               email:
+ *                 type: string
+ *                 format: email
+ *                 example: user@example.com
+ *               password:
+ *                 type: string
+ *                 minLength: 8
+ *                 example: Password123!
+ *                 description: 8자 이상, 영문/숫자/특수문자 포함
+ *               name:
+ *                 type: string
+ *                 example: 홍길동
+ *     responses:
+ *       201:
+ *         description: 회원가입 성공
+ *       400:
+ *         description: 유효성 검사 실패
+ *       409:
+ *         description: 이미 존재하는 이메일
+ */
+
+/**
+ * @swagger
+ * /auth/login:
+ *   post:
+ *     tags: [Auth]
+ *     summary: 로그인
+ *     description: 이메일과 비밀번호로 로그인합니다.
+ *     requestBody:
+ *       required: true
+ *       content:
+ *         application/json:
+ *           schema:
+ *             type: object
+ *             required: [email, password]
+ *             properties:
+ *               email:
+ *                 type: string
+ *                 format: email
+ *                 example: admin@admin.com
+ *               password:
+ *                 type: string
+ *                 example: Admin123!
+ *     responses:
+ *       200:
+ *         description: 로그인 성공
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 success:
+ *                   type: boolean
+ *                   example: true
+ *                 data:
+ *                   type: object
+ *                   properties:
+ *                     user:
+ *                       type: object
+ *                     accessToken:
+ *                       type: string
+ *                       description: JWT 액세스 토큰
+ *                     refreshToken:
+ *                       type: string
+ *                       description: JWT 리프레시 토큰
+ *       401:
+ *         description: 인증 실패
+ */
+
+/**
+ * @swagger
+ * /chat/completions:
+ *   post:
+ *     tags: [Chat]
+ *     summary: 채팅 완성 (OpenAI 호환)
+ *     description: |
+ *       AI 모델에 메시지를 보내고 응답을 받습니다.
+ *       OpenAI API와 호환되는 형식입니다.
+ *       
+ *       **인증**: JWT 토큰 또는 API 키 (sk-xxx)
+ *     security:
+ *       - BearerAuth: []
+ *     requestBody:
+ *       required: true
+ *       content:
+ *         application/json:
+ *           schema:
+ *             $ref: '#/components/schemas/ChatCompletionRequest'
+ *           examples:
+ *             simple:
+ *               summary: 간단한 질문
+ *               value:
+ *                 model: gemini-2.0-flash
+ *                 messages:
+ *                   - role: user
+ *                     content: 안녕하세요!
+ *             with_system:
+ *               summary: 시스템 프롬프트 포함
+ *               value:
+ *                 model: gemini-2.0-flash
+ *                 messages:
+ *                   - role: system
+ *                     content: 당신은 친절한 AI 어시스턴트입니다.
+ *                   - role: user
+ *                     content: 파이썬으로 Hello World 출력하는 코드 알려줘
+ *                 temperature: 0.7
+ *                 max_tokens: 1000
+ *     responses:
+ *       200:
+ *         description: 성공
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ChatCompletionResponse'
+ *       401:
+ *         description: 인증 실패
+ *       429:
+ *         description: 요청 한도 초과
+ */
+
+/**
+ * @swagger
+ * /models:
+ *   get:
+ *     tags: [Models]
+ *     summary: 모델 목록 조회
+ *     description: 사용 가능한 AI 모델 목록을 조회합니다.
+ *     security:
+ *       - BearerAuth: []
+ *     responses:
+ *       200:
+ *         description: 성공
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 object:
+ *                   type: string
+ *                   example: list
+ *                 data:
+ *                   type: array
+ *                   items:
+ *                     type: object
+ *                     properties:
+ *                       id:
+ *                         type: string
+ *                         example: gemini-2.0-flash
+ *                       object:
+ *                         type: string
+ *                         example: model
+ *                       owned_by:
+ *                         type: string
+ *                         example: google
+ */
+
+/**
+ * @swagger
+ * /api-keys:
+ *   get:
+ *     tags: [API Keys]
+ *     summary: API 키 목록 조회
+ *     description: 발급받은 API 키 목록을 조회합니다.
+ *     security:
+ *       - BearerAuth: []
+ *     responses:
+ *       200:
+ *         description: 성공
+ *   post:
+ *     tags: [API Keys]
+ *     summary: API 키 발급
+ *     description: 새 API 키를 발급받습니다. 키는 한 번만 표시됩니다.
+ *     security:
+ *       - BearerAuth: []
+ *     requestBody:
+ *       required: true
+ *       content:
+ *         application/json:
+ *           schema:
+ *             type: object
+ *             required: [name]
+ *             properties:
+ *               name:
+ *                 type: string
+ *                 example: My API Key
+ *                 description: API 키 이름
+ *     responses:
+ *       201:
+ *         description: 발급 성공
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 success:
+ *                   type: boolean
+ *                 data:
+ *                   type: object
+ *                   properties:
+ *                     key:
+ *                       type: string
+ *                       description: 발급된 API 키 (한 번만 표시)
+ *                       example: sk-abc123def456...
+ */
+
+/**
+ * @swagger
+ * /api-keys/{id}:
+ *   delete:
+ *     tags: [API Keys]
+ *     summary: API 키 폐기
+ *     description: API 키를 폐기합니다.
+ *     security:
+ *       - BearerAuth: []
+ *     parameters:
+ *       - in: path
+ *         name: id
+ *         required: true
+ *         schema:
+ *           type: string
+ *         description: API 키 ID
+ *     responses:
+ *       200:
+ *         description: 폐기 성공
+ *       404:
+ *         description: API 키를 찾을 수 없음
+ */
+
+/**
+ * @swagger
+ * /usage:
+ *   get:
+ *     tags: [Usage]
+ *     summary: 사용량 요약 조회
+ *     description: 오늘/이번 달 사용량 요약을 조회합니다.
+ *     security:
+ *       - BearerAuth: []
+ *     responses:
+ *       200:
+ *         description: 성공
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 success:
+ *                   type: boolean
+ *                 data:
+ *                   type: object
+ *                   properties:
+ *                     plan:
+ *                       type: string
+ *                       example: free
+ *                     limit:
+ *                       type: object
+ *                       properties:
+ *                         monthly:
+ *                           type: integer
+ *                         remaining:
+ *                           type: integer
+ *                     usage:
+ *                       type: object
+ *                       properties:
+ *                         today:
+ *                           type: object
+ *                         monthly:
+ *                           type: object
+ */
+
+/**
+ * @swagger
+ * /usage/logs:
+ *   get:
+ *     tags: [Usage]
+ *     summary: 사용 로그 조회
+ *     description: API 호출 로그를 조회합니다.
+ *     security:
+ *       - BearerAuth: []
+ *     parameters:
+ *       - in: query
+ *         name: page
+ *         schema:
+ *           type: integer
+ *           default: 1
+ *       - in: query
+ *         name: limit
+ *         schema:
+ *           type: integer
+ *           default: 20
+ *     responses:
+ *       200:
+ *         description: 성공
+ */
+
+/**
+ * @swagger
+ * /admin/users:
+ *   get:
+ *     tags: [Admin]
+ *     summary: 사용자 목록 조회 (관리자)
+ *     description: 모든 사용자 목록을 조회합니다. 관리자 권한 필요.
+ *     security:
+ *       - BearerAuth: []
+ *     responses:
+ *       200:
+ *         description: 성공
+ *       403:
+ *         description: 권한 없음
+ */
+
+/**
+ * @swagger
+ * /admin/providers:
+ *   get:
+ *     tags: [Admin]
+ *     summary: LLM 프로바이더 목록 (관리자)
+ *     description: LLM 프로바이더 설정을 조회합니다. 관리자 권한 필요.
+ *     security:
+ *       - BearerAuth: []
+ *     responses:
+ *       200:
+ *         description: 성공
+ *       403:
+ *         description: 권한 없음
+ */
+
+/**
+ * @swagger
+ * /admin/stats:
+ *   get:
+ *     tags: [Admin]
+ *     summary: 시스템 통계 (관리자)
+ *     description: 시스템 전체 통계를 조회합니다. 관리자 권한 필요.
+ *     security:
+ *       - BearerAuth: []
+ *     responses:
+ *       200:
+ *         description: 성공
+ *       403:
+ *         description: 권한 없음
+ */

backend-node/package-lock.json

@@ -22,6 +22,7 @@
         "express-rate-limit": "^7.1.5",
         "helmet": "^7.1.0",
         "html-to-docx": "^1.8.0",
+        "http-proxy-middleware": "^3.0.5",
         "iconv-lite": "^0.7.0",
         "imap": "^0.8.19",
         "joi": "^17.11.0",
@@ -3318,6 +3319,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/http-proxy": {
+      "version": "1.17.17",
+      "resolved": "https://registry.npmjs.org/@types/http-proxy/-/http-proxy-1.17.17.tgz",
+      "integrity": "sha512-ED6LB+Z1AVylNTu7hdzuBqOgMnvG/ld6wGCG8wFnAzKX5uyW2K3WD52v0gnLCTK/VLpXtKckgWuyScYK6cSPaw==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/imap": {
       "version": "0.8.42",
       "resolved": "https://registry.npmjs.org/@types/imap/-/imap-0.8.42.tgz",
@@ -4419,7 +4429,6 @@
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.3.tgz",
       "integrity": "sha512-yQbXgO/OSZVD2IsiLlro+7Hf6Q18EJrKSEsdoMzKePKXct3gvD8oLcOQdIzGupr5Fj+EDe8gO/lxc1BzfMpxvA==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "fill-range": "^7.1.1"
@@ -6154,7 +6163,6 @@
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.1.1.tgz",
       "integrity": "sha512-YsGpe3WHLK8ZYi4tWDg2Jy3ebRz2rXowDxnld4bkQB00cc/1Zw9AWnC0i9ztDJitivtQvaI9KaLyKrc+hBW0yg==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "to-regex-range": "^5.0.1"
@@ -6887,6 +6895,20 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/http-proxy": {
+      "version": "1.18.1",
+      "resolved": "https://registry.npmjs.org/http-proxy/-/http-proxy-1.18.1.tgz",
+      "integrity": "sha512-7mz/721AbnJwIVbnaSv1Cz3Am0ZLT/UBwkC92VlxhXv/k/BBQfM2fXElQNC27BVGr0uwUpplYPQM9LnaBMR5NQ==",
+      "license": "MIT",
+      "dependencies": {
+        "eventemitter3": "^4.0.0",
+        "follow-redirects": "^1.0.0",
+        "requires-port": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=8.0.0"
+      }
+    },
     "node_modules/http-proxy-agent": {
       "version": "7.0.2",
       "resolved": "https://registry.npmjs.org/http-proxy-agent/-/http-proxy-agent-7.0.2.tgz",
@@ -6900,6 +6922,29 @@
         "node": ">= 14"
       }
     },
+    "node_modules/http-proxy-middleware": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/http-proxy-middleware/-/http-proxy-middleware-3.0.5.tgz",
+      "integrity": "sha512-GLZZm1X38BPY4lkXA01jhwxvDoOkkXqjgVyUzVxiEK4iuRu03PZoYHhHRwxnfhQMDuaxi3vVri0YgSro/1oWqg==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/http-proxy": "^1.17.15",
+        "debug": "^4.3.6",
+        "http-proxy": "^1.18.1",
+        "is-glob": "^4.0.3",
+        "is-plain-object": "^5.0.0",
+        "micromatch": "^4.0.8"
+      },
+      "engines": {
+        "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
+      }
+    },
+    "node_modules/http-proxy/node_modules/eventemitter3": {
+      "version": "4.0.7",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.7.tgz",
+      "integrity": "sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw==",
+      "license": "MIT"
+    },
     "node_modules/https-proxy-agent": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-7.0.6.tgz",
@@ -7208,7 +7253,6 @@
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
       "integrity": "sha512-SbKbANkN603Vi4jEZv49LeVJMn4yGwsbzZworEoyEiutsN3nJYdbO36zfhGJ6QEDpOZIFkDtnq5JRxmvl3jsoQ==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.10.0"
@@ -7238,7 +7282,6 @@
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.3.tgz",
       "integrity": "sha512-xelSayHH36ZgE7ZWhli7pW34hNbNl8Ojv5KVmkJD4hBdD3th8Tfk9vYasLM+mXWOZhFkgZfxhLSnrwRr4elSSg==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "is-extglob": "^2.1.1"
@@ -7269,7 +7312,6 @@
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/is-number/-/is-number-7.0.0.tgz",
       "integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.12.0"
@@ -7294,6 +7336,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/is-plain-object": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-5.0.0.tgz",
+      "integrity": "sha512-VRSzKkbMm5jMDoKLbltAkFQ5Qr7VDiTFGXxYFXXowVj387GeGNOCsOH6Msy00SGZ3Fp84b1Naa1psqgcCIEP5Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/is-property": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/is-property/-/is-property-1.0.2.tgz",
@@ -8566,7 +8617,6 @@
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.8.tgz",
       "integrity": "sha512-PXwfBhYu0hBCPw8Dn0E+WDYb7af3dSLVWKi3HGv84IdF4TyFoC0ysxFd0Goxw7nSv4T/PzEJQxsYsEiFCKo2BA==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "braces": "^3.0.3",
@@ -9388,7 +9438,6 @@
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
       "integrity": "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=8.6"
@@ -9946,6 +9995,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/requires-port": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
+      "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==",
+      "license": "MIT"
+    },
     "node_modules/resolve": {
       "version": "1.22.10",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.10.tgz",
@@ -10824,7 +10879,6 @@
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
       "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "is-number": "^7.0.0"

backend-node/package.json

@@ -36,6 +36,7 @@
     "express-rate-limit": "^7.1.5",
     "helmet": "^7.1.0",
     "html-to-docx": "^1.8.0",
+    "http-proxy-middleware": "^3.0.5",
     "iconv-lite": "^0.7.0",
     "imap": "^0.8.19",
     "joi": "^17.11.0",

backend-node/src/app.ts

@@ -38,13 +38,16 @@ process.on("uncaughtException", (error: Error) => {
 // SIGTERM 시그널 처리 (Docker/Kubernetes 환경)
 process.on("SIGTERM", () => {
   logger.info("📴 SIGTERM 시그널 수신, graceful shutdown 시작...");
-  // 여기서 연결 풀 정리 등 cleanup 로직 추가 가능
+  const { stopAiAssistant } = require("./utils/startAiAssistant");
+  stopAiAssistant();
   process.exit(0);
 });
 
 // SIGINT 시그널 처리 (Ctrl+C)
 process.on("SIGINT", () => {
   logger.info("📴 SIGINT 시그널 수신, graceful shutdown 시작...");
+  const { stopAiAssistant } = require("./utils/startAiAssistant");
+  stopAiAssistant();
   process.exit(0);
 });
 
@@ -127,6 +130,7 @@ import cascadingHierarchyRoutes from "./routes/cascadingHierarchyRoutes"; // 다
 import categoryValueCascadingRoutes from "./routes/categoryValueCascadingRoutes"; // 카테고리 값 연쇄관계
 import categoryTreeRoutes from "./routes/categoryTreeRoutes"; // 카테고리 트리 (테스트)
 import processWorkStandardRoutes from "./routes/processWorkStandardRoutes"; // 공정 작업기준
+import aiAssistantProxy from "./routes/aiAssistantProxy"; // AI 어시스턴트 API 프록시 (같은 포트로 서비스)
 import { BatchSchedulerService } from "./services/batchSchedulerService";
 // import collectionRoutes from "./routes/collectionRoutes"; // 임시 주석
 // import batchRoutes from "./routes/batchRoutes"; // 임시 주석
@@ -313,6 +317,7 @@ app.use("/api/category-value-cascading", categoryValueCascadingRoutes); // 카
 app.use("/api/category-tree", categoryTreeRoutes); // 카테고리 트리 (테스트)
 app.use("/api/process-work-standard", processWorkStandardRoutes); // 공정 작업기준
 app.use("/api", screenEmbeddingRoutes); // 화면 임베딩 및 데이터 전달
+app.use("/api/ai/v1", aiAssistantProxy); // AI 어시스턴트 (동일 서비스 내 프록시 → AI 서비스 포트)
 app.use("/api/vehicle", vehicleTripRoutes); // 차량 운행 이력 관리
 // app.use("/api/collections", collectionRoutes); // 임시 주석
 // app.use("/api/batch", batchRoutes); // 임시 주석
@@ -398,6 +403,14 @@ app.listen(PORT, HOST, async () => {
   } catch (error) {
     logger.error(`❌ 메일 자동 삭제 스케줄러 시작 실패:`, error);
   }
+
+  // AI 어시스턴트 서비스 함께 기동 (한 번에 킬 가능)
+  try {
+    const { startAiAssistant } = await import("./utils/startAiAssistant");
+    startAiAssistant();
+  } catch (error) {
+    logger.warn("⚠️ AI 어시스턴트 기동 스킵:", error);
+  }
 });
 
 export default app;

backend-node/src/routes/aiAssistantProxy.ts

@@ -0,0 +1,31 @@
+/**
+ * AI 어시스턴트 API 프록시
+ * - /api/ai/v1/* 요청을 AI 서비스(기본 3100 포트)로 전달
+ * - VEXPLOR와 같은 서비스로 쓰려면: 프론트(9771) → 백엔드(8080) → 여기서 3100으로 프록시
+ */
+import { createProxyMiddleware } from "http-proxy-middleware";
+import type { RequestHandler } from "express";
+
+const AI_SERVICE_URL =
+  process.env.AI_ASSISTANT_SERVICE_URL || "http://127.0.0.1:3100";
+
+const aiAssistantProxy: RequestHandler = createProxyMiddleware({
+  target: AI_SERVICE_URL,
+  changeOrigin: true,
+  pathRewrite: { "^/api/ai/v1": "/api/v1" },
+  // 대상 서비스 미기동 시 502 등 에러 처리 (v3 타입에 없을 수 있음)
+  onError: (_err, _req, res) => {
+    if (!res.headersSent) {
+      res.status(502).json({
+        success: false,
+        error: {
+          code: "AI_SERVICE_UNAVAILABLE",
+          message:
+            "AI 어시스턴트 서비스를 사용할 수 없습니다. AI 서비스(기본 3100 포트)를 기동한 뒤 다시 시도하세요.",
+        },
+      });
+    }
+  },
+} as Parameters<typeof createProxyMiddleware>[0]);
+
+export default aiAssistantProxy;

backend-node/src/utils/startAiAssistant.ts

@@ -0,0 +1,65 @@
+/**
+ * AI 어시스턴트 서비스를 자식 프로세스로 기동
+ * - backend-node 서버 기동 시 함께 띄우고, 종료 시 함께 종료 (한 번에 킬)
+ */
+import path from "path";
+import { spawn, ChildProcess } from "child_process";
+import { logger } from "./logger";
+
+const AI_PORT = process.env.AI_ASSISTANT_SERVICE_PORT || "3100";
+
+let aiAssistantProcess: ChildProcess | null = null;
+
+/** ERP-node/ai-assistant 경로 (backend-node 기준 상대) */
+function getAiAssistantDir(): string {
+  return path.resolve(process.cwd(), "..", "ai-assistant");
+}
+
+/**
+ * AI 어시스턴트 서비스 기동 (있으면 띄움, 실패해도 backend는 계속 동작)
+ */
+export function startAiAssistant(): void {
+  const aiDir = getAiAssistantDir();
+  const appPath = path.join(aiDir, "src", "app.js");
+
+  try {
+    const fs = require("fs");
+    if (!fs.existsSync(appPath)) {
+      logger.info(`⏭️ AI 어시스턴트 스킵 (경로 없음: ${appPath})`);
+      return;
+    }
+  } catch {
+    return;
+  }
+
+  aiAssistantProcess = spawn("node", ["src/app.js"], {
+    cwd: aiDir,
+    stdio: "inherit",
+    env: { ...process.env, PORT: AI_PORT },
+    shell: true, // Windows에서 node 경로 인식
+  });
+
+  aiAssistantProcess.on("error", (err) => {
+    logger.warn(`⚠️ AI 어시스턴트 프로세스 에러: ${err.message}`);
+  });
+
+  aiAssistantProcess.on("exit", (code, signal) => {
+    aiAssistantProcess = null;
+    if (code != null && code !== 0) {
+      logger.warn(`⚠️ AI 어시스턴트 종료 (code=${code}, signal=${signal})`);
+    }
+  });
+
+  logger.info(`🤖 AI 어시스턴트 서비스 기동 (포트 ${AI_PORT}, cwd: ${aiDir})`);
+}
+
+/**
+ * AI 어시스턴트 프로세스 종료 (SIGTERM/SIGINT 시 호출)
+ */
+export function stopAiAssistant(): void {
+  if (aiAssistantProcess && aiAssistantProcess.kill) {
+    aiAssistantProcess.kill("SIGTERM");
+    aiAssistantProcess = null;
+    logger.info("🤖 AI 어시스턴트 프로세스 종료");
+  }
+}

frontend/app/(main)/admin/aiAssistant/api-keys/page.tsx

@@ -0,0 +1,299 @@
+"use client";
+
+import { useState, useEffect } from "react";
+import { aiAssistantApi } from "@/lib/api/aiAssistant";
+import type { ApiKeyItem } from "@/lib/api/aiAssistant";
+import {
+  Key,
+  Plus,
+  Copy,
+  Trash2,
+  Loader2,
+  Check,
+  Eye,
+  EyeOff,
+} from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from "@/components/ui/dialog";
+import {
+  Table,
+  TableBody,
+  TableCell,
+  TableHead,
+  TableHeader,
+  TableRow,
+} from "@/components/ui/table";
+import { toast } from "sonner";
+
+export default function AiAssistantApiKeysPage() {
+  const [loading, setLoading] = useState(true);
+  const [apiKeys, setApiKeys] = useState<ApiKeyItem[]>([]);
+  const [createDialogOpen, setCreateDialogOpen] = useState(false);
+  const [newKeyDialogOpen, setNewKeyDialogOpen] = useState(false);
+  const [newKeyName, setNewKeyName] = useState("");
+  const [newKey, setNewKey] = useState("");
+  const [creating, setCreating] = useState(false);
+  const [showKey, setShowKey] = useState(false);
+  const [copied, setCopied] = useState(false);
+
+  useEffect(() => {
+    loadApiKeys();
+  }, []);
+
+  const loadApiKeys = async () => {
+    setLoading(true);
+    try {
+      const res = await aiAssistantApi.get("/api-keys");
+      setApiKeys(res.data?.data ?? []);
+    } catch {
+      toast.error("API 키 목록을 불러오는데 실패했습니다.");
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const createApiKey = async () => {
+    if (!newKeyName.trim()) {
+      toast.error("키 이름을 입력해주세요.");
+      return;
+    }
+    setCreating(true);
+    try {
+      const res = await aiAssistantApi.post("/api-keys", { name: newKeyName });
+      setNewKey((res.data?.data as { key?: string })?.key ?? "");
+      setCreateDialogOpen(false);
+      setNewKeyDialogOpen(true);
+      setNewKeyName("");
+      loadApiKeys();
+      toast.success("API 키가 생성되었습니다.");
+    } catch (err: unknown) {
+      const msg =
+        err && typeof err === "object" && "response" in err
+          ? (err as { response?: { data?: { error?: { message?: string } } } }).response?.data
+              ?.error?.message
+          : null;
+      toast.error(msg ?? "API 키 생성에 실패했습니다.");
+    } finally {
+      setCreating(false);
+    }
+  };
+
+  const revokeApiKey = async (id: number) => {
+    if (!confirm("이 API 키를 폐기하시겠습니까?")) return;
+    try {
+      await aiAssistantApi.delete(`/api-keys/${id}`);
+      loadApiKeys();
+      toast.success("API 키가 폐기되었습니다.");
+    } catch {
+      toast.error("API 키 폐기에 실패했습니다.");
+    }
+  };
+
+  const copyToClipboard = async (text: string) => {
+    try {
+      await navigator.clipboard.writeText(text);
+      setCopied(true);
+      toast.success("클립보드에 복사되었습니다.");
+      setTimeout(() => setCopied(false), 2000);
+    } catch {
+      toast.error("복사에 실패했습니다.");
+    }
+  };
+
+  const baseUrl =
+    typeof window !== "undefined"
+      ? process.env.NEXT_PUBLIC_AI_ASSISTANT_API_URL || "http://localhost:3100/api/v1"
+      : "";
+
+  if (loading) {
+    return (
+      <div className="flex h-64 items-center justify-center">
+        <Loader2 className="text-primary h-8 w-8 animate-spin" />
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-3xl font-bold tracking-tight">API 키 관리</h1>
+          <p className="text-muted-foreground mt-1">
+            외부 시스템에서 AI Assistant API를 사용하기 위한 키를 관리합니다.
+          </p>
+        </div>
+        <Dialog open={createDialogOpen} onOpenChange={setCreateDialogOpen}>
+          <DialogTrigger asChild>
+            <Button>
+              <Plus className="mr-2 h-4 w-4" />
+              새 API 키
+            </Button>
+          </DialogTrigger>
+          <DialogContent>
+            <DialogHeader>
+              <DialogTitle>새 API 키 생성</DialogTitle>
+              <DialogDescription>
+                새로운 API 키를 생성합니다. 키는 한 번만 표시되므로 안전하게 보관하세요.
+              </DialogDescription>
+            </DialogHeader>
+            <div className="space-y-4 py-4">
+              <div className="space-y-2">
+                <Label htmlFor="keyName">키 이름</Label>
+                <Input
+                  id="keyName"
+                  placeholder="예: Production Server"
+                  value={newKeyName}
+                  onChange={(e) => setNewKeyName(e.target.value)}
+                />
+              </div>
+            </div>
+            <DialogFooter>
+              <Button variant="outline" onClick={() => setCreateDialogOpen(false)}>
+                취소
+              </Button>
+              <Button onClick={createApiKey} disabled={creating}>
+                {creating && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
+                생성
+              </Button>
+            </DialogFooter>
+          </DialogContent>
+        </Dialog>
+      </div>
+
+      <Dialog open={newKeyDialogOpen} onOpenChange={setNewKeyDialogOpen}>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>API 키가 생성되었습니다</DialogTitle>
+            <DialogDescription>
+              이 키는 다시 표시되지 않습니다. 안전한 곳에 복사하여 보관하세요.
+            </DialogDescription>
+          </DialogHeader>
+          <div className="space-y-4 py-4">
+            <div className="flex items-center gap-2">
+              <Input
+                type={showKey ? "text" : "password"}
+                value={newKey}
+                readOnly
+                className="font-mono"
+              />
+              <Button variant="outline" size="icon" onClick={() => setShowKey(!showKey)}>
+                {showKey ? <EyeOff className="h-4 w-4" /> : <Eye className="h-4 w-4" />}
+              </Button>
+              <Button variant="outline" size="icon" onClick={() => copyToClipboard(newKey)}>
+                {copied ? <Check className="h-4 w-4" /> : <Copy className="h-4 w-4" />}
+              </Button>
+            </div>
+          </div>
+          <DialogFooter>
+            <Button onClick={() => setNewKeyDialogOpen(false)}>확인</Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+
+      <Card>
+        <CardHeader>
+          <CardTitle>API 키 목록</CardTitle>
+          <CardDescription>발급된 모든 API 키를 확인하고 관리합니다.</CardDescription>
+        </CardHeader>
+        <CardContent>
+          {apiKeys.length === 0 ? (
+            <div className="flex flex-col items-center justify-center py-12 text-center">
+              <Key className="text-muted-foreground mb-4 h-12 w-12" />
+              <h3 className="text-lg font-medium">API 키가 없습니다</h3>
+              <p className="text-muted-foreground mt-1 text-sm">새 API 키를 생성하여 시작하세요.</p>
+            </div>
+          ) : (
+            <Table>
+              <TableHeader>
+                <TableRow>
+                  <TableHead>이름</TableHead>
+                  <TableHead>키</TableHead>
+                  <TableHead>상태</TableHead>
+                  <TableHead>사용량</TableHead>
+                  <TableHead>마지막 사용</TableHead>
+                  <TableHead>생성일</TableHead>
+                  <TableHead className="text-right">작업</TableHead>
+                </TableRow>
+              </TableHeader>
+              <TableBody>
+                {apiKeys.map((key) => (
+                  <TableRow key={key.id}>
+                    <TableCell className="font-medium">{key.name}</TableCell>
+                    <TableCell>
+                      <div className="flex items-center gap-2">
+                        <code className="bg-muted rounded px-2 py-1 text-sm">
+                          {key.keyPrefix}...
+                        </code>
+                        <Button
+                          variant="ghost"
+                          size="icon"
+                          className="h-8 w-8"
+                          onClick={() => copyToClipboard(key.keyPrefix + "...")}
+                        >
+                          <Copy className="h-3 w-3" />
+                        </Button>
+                      </div>
+                    </TableCell>
+                    <TableCell>
+                      <Badge variant={key.status === "active" ? "success" : "secondary"}>
+                        {key.status === "active" ? "활성" : "폐기됨"}
+                      </Badge>
+                    </TableCell>
+                    <TableCell>{(key.usageCount ?? 0).toLocaleString()} 토큰</TableCell>
+                    <TableCell>
+                      {key.lastUsedAt
+                        ? new Date(key.lastUsedAt).toLocaleDateString("ko-KR")
+                        : "-"}
+                    </TableCell>
+                    <TableCell>{new Date(key.createdAt).toLocaleDateString("ko-KR")}</TableCell>
+                    <TableCell className="text-right">
+                      {key.status === "active" && (
+                        <Button
+                          variant="ghost"
+                          size="icon"
+                          className="text-destructive hover:text-destructive h-8 w-8"
+                          onClick={() => revokeApiKey(key.id)}
+                        >
+                          <Trash2 className="h-4 w-4" />
+                        </Button>
+                      )}
+                    </TableCell>
+                  </TableRow>
+                ))}
+              </TableBody>
+            </Table>
+          )}
+        </CardContent>
+      </Card>
+
+      <Card>
+        <CardHeader>
+          <CardTitle>API 사용 방법</CardTitle>
+          <CardDescription>
+            발급받은 API 키를 Authorization 헤더에 포함하여 요청하세요.
+          </CardDescription>
+        </CardHeader>
+        <CardContent>
+          <pre className="bg-muted overflow-x-auto rounded-lg p-4 text-sm">
+            {`curl -X POST ${baseUrl}/chat/completions \\
+  -H "Content-Type: application/json" \\
+  -H "Authorization: Bearer YOUR_API_KEY" \\
+  -d '{"model": "gemini-2.0-flash", "messages": [{"role": "user", "content": "Hello!"}]}'`}
+          </pre>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}

frontend/app/(main)/admin/aiAssistant/api-test/page.tsx

@@ -0,0 +1,180 @@
+"use client";
+
+import { useState } from "react";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Textarea } from "@/components/ui/textarea";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import { toast } from "sonner";
+
+const DEFAULT_BASE = "http://localhost:3100/api/v1";
+const PRESETS = [
+  { name: "채팅 완성", method: "POST", endpoint: "/chat/completions", body: '{"model":"gemini-2.0-flash","messages":[{"role":"user","content":"안녕하세요!"}],"temperature":0.7}' },
+  { name: "모델 목록", method: "GET", endpoint: "/models", body: "" },
+  { name: "사용량", method: "GET", endpoint: "/usage", body: "" },
+  { name: "API 키 목록", method: "GET", endpoint: "/api-keys", body: "" },
+];
+
+export default function AiAssistantApiTestPage() {
+  const [baseUrl, setBaseUrl] = useState(
+    typeof window !== "undefined" ? (process.env.NEXT_PUBLIC_AI_ASSISTANT_API_URL || DEFAULT_BASE) : DEFAULT_BASE
+  );
+  const [apiKey, setApiKey] = useState("");
+  const [method, setMethod] = useState("POST");
+  const [endpoint, setEndpoint] = useState("/chat/completions");
+  const [body, setBody] = useState(PRESETS[0].body);
+  const [loading, setLoading] = useState(false);
+  const [response, setResponse] = useState<{ status: number; statusText: string; data: unknown } | null>(null);
+  const [responseTime, setResponseTime] = useState<number | null>(null);
+  const [copied, setCopied] = useState(false);
+
+  const apply = (p: (typeof PRESETS)[0]) => {
+    setMethod(p.method);
+    setEndpoint(p.endpoint);
+    setBody(p.body);
+  };
+
+  const send = async () => {
+    setLoading(true);
+    setResponse(null);
+    setResponseTime(null);
+    const start = Date.now();
+    try {
+      const headers: Record<string, string> = { "Content-Type": "application/json" };
+      if (apiKey) headers["Authorization"] = `Bearer ${apiKey}`;
+      const opt: RequestInit = { method, headers };
+      if (method !== "GET" && body.trim()) {
+        try {
+          JSON.parse(body);
+          opt.body = body;
+        } catch {
+          toast.error("JSON 형식 오류");
+          setLoading(false);
+          return;
+        }
+      }
+      const res = await fetch(`${baseUrl}${endpoint}`, opt);
+      const elapsed = Date.now() - start;
+      setResponseTime(elapsed);
+      const ct = res.headers.get("content-type");
+      const data = ct?.includes("json") ? await res.json() : await res.text();
+      setResponse({ status: res.status, statusText: res.statusText, data });
+      toast.success(res.ok ? `성공 ${res.status}` : `실패 ${res.status}`);
+    } catch (e) {
+      setResponseTime(Date.now() - start);
+      setResponse({ status: 0, statusText: "Network Error", data: { error: String(e) } });
+      toast.error("네트워크 오류");
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const copyRes = () => {
+    navigator.clipboard.writeText(JSON.stringify(response?.data, null, 2));
+    setCopied(true);
+    toast.success("복사됨");
+    setTimeout(() => setCopied(false), 2000);
+  };
+
+  const statusV = (s: number) => (s >= 200 && s < 300 ? "success" : s >= 400 ? "destructive" : "secondary");
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-3xl font-bold tracking-tight">API 테스트</h1>
+        <p className="text-muted-foreground mt-1">API를 직접 호출하여 테스트합니다.</p>
+      </div>
+      <div className="grid gap-6 lg:grid-cols-2">
+        <div className="space-y-4">
+          <Card>
+            <CardHeader className="pb-3">
+              <CardTitle className="text-base">API 설정</CardTitle>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              <div className="space-y-2">
+                <Label>Base URL</Label>
+                <Input value={baseUrl} onChange={(e) => setBaseUrl(e.target.value)} />
+              </div>
+              <div className="space-y-2">
+                <Label>API 키 또는 JWT</Label>
+                <Input type="password" value={apiKey} onChange={(e) => setApiKey(e.target.value)} placeholder="sk-xxx" />
+              </div>
+            </CardContent>
+          </Card>
+          <Card>
+            <CardHeader className="pb-3">
+              <CardTitle className="text-base">빠른 선택</CardTitle>
+            </CardHeader>
+            <CardContent>
+              <div className="flex flex-wrap gap-2">
+                {PRESETS.map((p, i) => (
+                  <Button key={i} variant="outline" size="sm" onClick={() => apply(p)}>
+                    <Badge variant="secondary" className="mr-2 text-xs">{p.method}</Badge>
+                    {p.name}
+                  </Button>
+                ))}
+              </div>
+            </CardContent>
+          </Card>
+          <Card>
+            <CardHeader className="pb-3">
+              <CardTitle className="text-base">요청</CardTitle>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              <div className="flex gap-2">
+                <Select value={method} onValueChange={setMethod}>
+                  <SelectTrigger className="w-[100px]"><SelectValue /></SelectTrigger>
+                  <SelectContent>
+                    <SelectItem value="GET">GET</SelectItem>
+                    <SelectItem value="POST">POST</SelectItem>
+                    <SelectItem value="PUT">PUT</SelectItem>
+                    <SelectItem value="DELETE">DELETE</SelectItem>
+                  </SelectContent>
+                </Select>
+                <Input value={endpoint} onChange={(e) => setEndpoint(e.target.value)} className="flex-1" />
+              </div>
+              {method !== "GET" && (
+                <div className="space-y-2">
+                  <Label>Body (JSON)</Label>
+                  <Textarea value={body} onChange={(e) => setBody(e.target.value)} className="font-mono text-sm min-h-[180px]" />
+                </div>
+              )}
+              <Button className="w-full" onClick={send} disabled={loading}>
+                {loading ? "요청 중..." : "요청 보내기"}
+              </Button>
+            </CardContent>
+          </Card>
+        </div>
+        <Card className="h-full">
+          <CardHeader className="pb-3">
+            <div className="flex items-center justify-between">
+              <CardTitle className="text-base">응답</CardTitle>
+              {response && (
+                <div className="flex items-center gap-2">
+                  <Badge variant={statusV(response.status)}>{response.status} {response.statusText}</Badge>
+                  {responseTime != null && <Badge variant="outline">{responseTime}ms</Badge>}
+                  <Button variant="ghost" size="icon" className="h-8 w-8" onClick={copyRes}>
+                    {copied ? "✓" : "복사"}
+                  </Button>
+                </div>
+              )}
+            </div>
+          </CardHeader>
+          <CardContent>
+            {!response ? (
+              <p className="text-muted-foreground py-12 text-center">요청을 보내면 응답이 표시됩니다.</p>
+            ) : (
+              <pre className="bg-muted max-h-[500px] overflow-auto rounded-lg p-4 text-sm font-mono whitespace-pre-wrap">
+                {typeof response.data === "string" ? response.data : JSON.stringify(response.data, null, 2)}
+              </pre>
+            )}
+          </CardContent>
+        </Card>
+      </div>
+    </div>
+  );
+}

frontend/app/(main)/admin/aiAssistant/chat/page.tsx

@@ -0,0 +1,142 @@
+"use client";
+
+import { useState, useRef, useEffect } from "react";
+import { aiAssistantApi } from "@/lib/api/aiAssistant";
+import { Send, Loader2, Bot, User, Trash2, Settings2 } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { Textarea } from "@/components/ui/textarea";
+import { Card, CardContent } from "@/components/ui/card";
+import { ScrollArea } from "@/components/ui/scroll-area";
+import { Avatar, AvatarFallback } from "@/components/ui/avatar";
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
+import { cn } from "@/lib/utils";
+import { toast } from "sonner";
+
+type ChatMessage = { role: "user" | "assistant"; content: string };
+type ModelItem = { id: string };
+
+export default function AiAssistantChatPage() {
+  const [messages, setMessages] = useState<ChatMessage[]>([]);
+  const [input, setInput] = useState("");
+  const [loading, setLoading] = useState(false);
+  const [models, setModels] = useState<ModelItem[]>([]);
+  const [selectedModel, setSelectedModel] = useState("gemini-2.0-flash");
+  const messagesEndRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    aiAssistantApi.get("/models").then((res) => {
+      const list = (res.data?.data as ModelItem[]) ?? [];
+      setModels(list);
+      if (list.length && !list.some((m) => m.id === selectedModel)) setSelectedModel(list[0].id);
+    }).catch(() => {});
+  }, []);
+
+  useEffect(() => {
+    messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
+  }, [messages]);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    if (!input.trim() || loading) return;
+    const userMsg: ChatMessage = { role: "user", content: input.trim() };
+    setMessages((prev) => [...prev, userMsg]);
+    setInput("");
+    setLoading(true);
+    try {
+      const res = await aiAssistantApi.post("/chat/completions", {
+        model: selectedModel,
+        messages: [...messages, userMsg].map((m) => ({ role: m.role, content: m.content })),
+      });
+      const content = (res.data as { choices?: Array<{ message?: { content?: string } }> })?.choices?.[0]?.message?.content ?? "";
+      setMessages((prev) => [...prev, { role: "assistant", content }]);
+    } catch (err: unknown) {
+      const msg = err && typeof err === "object" && "response" in err
+        ? (err as { response?: { data?: { error?: { message?: string } } } }).response?.data?.error?.message
+        : null;
+      toast.error(msg ?? "AI 응답 실패");
+      setMessages((prev) => prev.slice(0, -1));
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="flex h-[calc(100vh-8rem)] flex-col">
+      <div className="mb-4 flex items-center justify-between">
+        <div>
+          <h1 className="text-3xl font-bold tracking-tight">AI 채팅</h1>
+          <p className="text-muted-foreground mt-1">AI Assistant와 대화하세요.</p>
+        </div>
+        <div className="flex items-center gap-2">
+          <Select value={selectedModel} onValueChange={setSelectedModel}>
+            <SelectTrigger className="w-[200px]">
+              <Settings2 className="mr-2 h-4 w-4" />
+              <SelectValue placeholder="모델 선택" />
+            </SelectTrigger>
+            <SelectContent>
+              {models.map((m) => (
+                <SelectItem key={m.id} value={m.id}>{m.id}</SelectItem>
+              ))}
+              {models.length === 0 && <SelectItem value="gemini-2.0-flash">gemini-2.0-flash</SelectItem>}
+            </SelectContent>
+          </Select>
+          <Button variant="outline" size="icon" onClick={() => setMessages([])}>
+            <Trash2 className="h-4 w-4" />
+          </Button>
+        </div>
+      </div>
+      <Card className="flex flex-1 flex-col overflow-hidden">
+        <ScrollArea className="flex-1 p-4">
+          {messages.length === 0 ? (
+            <div className="flex h-full flex-col items-center justify-center text-center">
+              <div className="bg-primary/10 mb-4 flex h-16 w-16 items-center justify-center rounded-full">
+                <Bot className="text-primary h-8 w-8" />
+              </div>
+              <h3 className="text-lg font-medium">AI Assistant</h3>
+              <p className="text-muted-foreground mt-1 max-w-sm">무엇이든 물어보세요.</p>
+            </div>
+          ) : (
+            <div className="space-y-4">
+              {messages.map((msg, i) => (
+                <div key={i} className={cn("flex gap-3", msg.role === "user" && "flex-row-reverse")}>
+                  <Avatar className="h-8 w-8 shrink-0">
+                    <AvatarFallback className={cn(msg.role === "user" ? "bg-primary text-primary-foreground" : "bg-muted")}>
+                      {msg.role === "user" ? <User className="h-4 w-4" /> : <Bot className="h-4 w-4" />}
+                    </AvatarFallback>
+                  </Avatar>
+                  <div className={cn("max-w-[80%] rounded-lg px-4 py-2", msg.role === "user" ? "bg-primary text-primary-foreground" : "bg-muted")}>
+                    <p className="whitespace-pre-wrap text-sm">{msg.content}</p>
+                  </div>
+                </div>
+              ))}
+              {loading && (
+                <div className="flex gap-3">
+                  <Avatar className="h-8 w-8 shrink-0">
+                    <AvatarFallback className="bg-muted"><Bot className="h-4 w-4" /></AvatarFallback>
+                  </Avatar>
+                  <div className="rounded-lg bg-muted px-4 py-2"><Loader2 className="h-4 w-4 animate-spin" /></div>
+                </div>
+              )}
+              <div ref={messagesEndRef} />
+            </div>
+          )}
+        </ScrollArea>
+        <CardContent className="border-t p-4">
+          <form onSubmit={handleSubmit} className="flex gap-2">
+            <Textarea
+              value={input}
+              onChange={(e) => setInput(e.target.value)}
+              onKeyDown={(e) => e.key === "Enter" && !e.shiftKey && (e.preventDefault(), handleSubmit(e as unknown as React.FormEvent))}
+              placeholder="메시지 입력 (Shift+Enter 줄바꿈)"
+              className="max-h-[200px] min-h-[60px] resize-none"
+              disabled={loading}
+            />
+            <Button type="submit" size="icon" className="h-[60px] w-[60px]" disabled={loading || !input.trim()}>
+              {loading ? <Loader2 className="h-5 w-5 animate-spin" /> : <Send className="h-5 w-5" />}
+            </Button>
+          </form>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}

frontend/app/(main)/admin/aiAssistant/dashboard/page.tsx

@@ -0,0 +1,190 @@
+"use client";
+
+import { useState, useEffect } from "react";
+import { getAiAssistantAuth, aiAssistantApi } from "@/lib/api/aiAssistant";
+import type { UsageSummary, ApiKeyItem, AdminStats } from "@/lib/api/aiAssistant";
+import { BarChart3, Key, Zap, TrendingUp, Loader2, AlertCircle, Users, Cpu } from "lucide-react";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Progress } from "@/components/ui/progress";
+import { toast } from "sonner";
+
+export default function AiAssistantDashboardPage() {
+  const auth = getAiAssistantAuth();
+  const user = auth?.user;
+  const isAdmin = user?.role === "admin";
+  const [loading, setLoading] = useState(true);
+  const [usage, setUsage] = useState<UsageSummary | null>(null);
+  const [apiKeys, setApiKeys] = useState<ApiKeyItem[]>([]);
+  const [stats, setStats] = useState<AdminStats | null>(null);
+
+  useEffect(() => {
+    loadData();
+  }, []);
+
+  const loadData = async () => {
+    setLoading(true);
+    try {
+      const usageRes = await aiAssistantApi.get("/usage");
+      setUsage(usageRes.data?.data ?? null);
+      const keysRes = await aiAssistantApi.get("/api-keys");
+      setApiKeys(keysRes.data?.data ?? []);
+      if (isAdmin) {
+        const statsRes = await aiAssistantApi.get("/admin/stats");
+        setStats(statsRes.data?.data ?? null);
+      }
+    } catch {
+      toast.error("데이터를 불러오는데 실패했습니다.");
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  if (loading) {
+    return (
+      <div className="flex h-64 items-center justify-center">
+        <Loader2 className="text-primary h-8 w-8 animate-spin" />
+      </div>
+    );
+  }
+
+  const monthlyTokens = usage?.usage?.monthly?.totalTokens ?? 0;
+  const monthlyLimit = usage?.limit?.monthly ?? 0;
+  const usagePercent = monthlyLimit > 0 ? Math.round((monthlyTokens / monthlyLimit) * 100) : 0;
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-3xl font-bold tracking-tight">대시보드</h1>
+        <p className="text-muted-foreground mt-1">안녕하세요, {user?.name || user?.email}님!</p>
+      </div>
+
+      <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
+        <Card>
+          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+            <CardTitle className="text-sm font-medium">오늘 사용량</CardTitle>
+            <Zap className="text-muted-foreground h-4 w-4" />
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold">
+              {(usage?.usage?.today?.tokens ?? 0).toLocaleString()}
+            </div>
+            <p className="text-muted-foreground text-xs">토큰</p>
+          </CardContent>
+        </Card>
+        <Card>
+          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+            <CardTitle className="text-sm font-medium">이번 달 사용량</CardTitle>
+            <BarChart3 className="text-muted-foreground h-4 w-4" />
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold">{monthlyTokens.toLocaleString()}</div>
+            <p className="text-muted-foreground mb-2 text-xs">
+              / {monthlyLimit.toLocaleString()} 토큰
+            </p>
+            <Progress value={usagePercent} className="h-2" />
+            <p className="text-muted-foreground mt-1 text-right text-xs">{usagePercent}% 사용</p>
+          </CardContent>
+        </Card>
+        <Card>
+          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+            <CardTitle className="text-sm font-medium">오늘 요청 수</CardTitle>
+            <TrendingUp className="text-muted-foreground h-4 w-4" />
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold">
+              {(usage?.usage?.today?.requests ?? 0).toLocaleString()}
+            </div>
+            <p className="text-muted-foreground text-xs">회</p>
+          </CardContent>
+        </Card>
+        <Card>
+          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+            <CardTitle className="text-sm font-medium">활성 API 키</CardTitle>
+            <Key className="text-muted-foreground h-4 w-4" />
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold">
+              {apiKeys.filter((k) => k.status === "active").length}
+            </div>
+            <p className="text-muted-foreground text-xs">개</p>
+          </CardContent>
+        </Card>
+      </div>
+
+      {isAdmin && stats && (
+        <Card className="bg-gradient-to-r from-primary to-primary/80 text-primary-foreground">
+          <CardHeader>
+            <CardTitle>시스템 현황</CardTitle>
+            <CardDescription className="text-primary-foreground/70">전체 시스템 통계</CardDescription>
+          </CardHeader>
+          <CardContent>
+            <div className="grid grid-cols-2 gap-4 md:grid-cols-4">
+              <div className="space-y-1">
+                <div className="flex items-center gap-2">
+                  <Users className="h-4 w-4" />
+                  <span className="text-sm opacity-80">전체 사용자</span>
+                </div>
+                <p className="text-2xl font-bold">{stats.users?.total ?? 0}</p>
+              </div>
+              <div className="space-y-1">
+                <div className="flex items-center gap-2">
+                  <Users className="h-4 w-4" />
+                  <span className="text-sm opacity-80">활성 사용자</span>
+                </div>
+                <p className="text-2xl font-bold">{stats.users?.active ?? 0}</p>
+              </div>
+              <div className="space-y-1">
+                <div className="flex items-center gap-2">
+                  <Key className="h-4 w-4" />
+                  <span className="text-sm opacity-80">전체 API 키</span>
+                </div>
+                <p className="text-2xl font-bold">{stats.apiKeys?.total ?? 0}</p>
+              </div>
+              <div className="space-y-1">
+                <div className="flex items-center gap-2">
+                  <Cpu className="h-4 w-4" />
+                  <span className="text-sm opacity-80">활성 프로바이더</span>
+                </div>
+                <p className="text-2xl font-bold">{stats.providers?.active ?? 0}</p>
+              </div>
+            </div>
+          </CardContent>
+        </Card>
+      )}
+
+      <Card>
+        <CardHeader>
+          <CardTitle>내 API 키</CardTitle>
+          <CardDescription>발급받은 API 키 목록</CardDescription>
+        </CardHeader>
+        <CardContent>
+          {apiKeys.length === 0 ? (
+            <div className="flex flex-col items-center justify-center py-8 text-center">
+              <AlertCircle className="text-muted-foreground mb-3 h-10 w-10" />
+              <p className="text-muted-foreground">API 키가 없습니다.</p>
+              <p className="text-muted-foreground text-sm">새 키를 발급받으세요.</p>
+            </div>
+          ) : (
+            <div className="space-y-3">
+              {apiKeys.slice(0, 5).map((key) => (
+                <div
+                  key={key.id}
+                  className="bg-card flex items-center justify-between rounded-lg border p-3"
+                >
+                  <div>
+                    <p className="font-medium">{key.name}</p>
+                    <p className="text-muted-foreground font-mono text-sm">{key.keyPrefix}...</p>
+                  </div>
+                  <Badge variant={key.status === "active" ? "success" : "secondary"}>
+                    {key.status === "active" ? "활성" : "비활성"}
+                  </Badge>
+                </div>
+              ))}
+            </div>
+          )}
+        </CardContent>
+      </Card>
+    </div>
+  );
+}

frontend/app/(main)/admin/aiAssistant/history/page.tsx

@@ -0,0 +1,157 @@
+"use client";
+
+import { useState, useEffect } from "react";
+import { aiAssistantApi } from "@/lib/api/aiAssistant";
+import type { UsageLogItem } from "@/lib/api/aiAssistant";
+import { History, Loader2, MessageSquare, Clock, Zap, CheckCircle, XCircle } from "lucide-react";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import {
+  Table,
+  TableBody,
+  TableCell,
+  TableHead,
+  TableHeader,
+  TableRow,
+} from "@/components/ui/table";
+import { Button } from "@/components/ui/button";
+import { toast } from "sonner";
+
+export default function AiAssistantHistoryPage() {
+  const [loading, setLoading] = useState(true);
+  const [logs, setLogs] = useState<UsageLogItem[]>([]);
+  const [page, setPage] = useState(1);
+  const [totalPages, setTotalPages] = useState(1);
+
+  useEffect(() => {
+    loadLogs();
+  }, [page]);
+
+  const loadLogs = async () => {
+    setLoading(true);
+    try {
+      const res = await aiAssistantApi.get(`/usage/logs?page=${page}&limit=20`);
+      const data = res.data?.data as { logs?: UsageLogItem[]; pagination?: { totalPages?: number } };
+      setLogs(data?.logs ?? []);
+      setTotalPages(data?.pagination?.totalPages ?? 1);
+    } catch {
+      toast.error("대화 이력을 불러오는데 실패했습니다.");
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  if (loading && logs.length === 0) {
+    return (
+      <div className="flex h-64 items-center justify-center">
+        <Loader2 className="text-primary h-8 w-8 animate-spin" />
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-3xl font-bold tracking-tight">대화 이력</h1>
+        <p className="text-muted-foreground mt-1">AI Assistant와의 대화 기록을 확인합니다.</p>
+      </div>
+
+      <Card>
+        <CardHeader>
+          <CardTitle>API 호출 로그</CardTitle>
+          <CardDescription>최근 API 호출 기록</CardDescription>
+        </CardHeader>
+        <CardContent>
+          {logs.length === 0 ? (
+            <div className="flex flex-col items-center justify-center py-12 text-center">
+              <History className="text-muted-foreground mb-4 h-12 w-12" />
+              <h3 className="text-lg font-medium">대화 이력이 없습니다</h3>
+              <p className="text-muted-foreground mt-1 text-sm">AI 채팅을 시작하면 이력이 표시됩니다.</p>
+            </div>
+          ) : (
+            <>
+              <Table>
+                <TableHeader>
+                  <TableRow>
+                    <TableHead>상태</TableHead>
+                    <TableHead>프로바이더</TableHead>
+                    <TableHead>모델</TableHead>
+                    <TableHead>토큰</TableHead>
+                    <TableHead>비용</TableHead>
+                    <TableHead>응답시간</TableHead>
+                    <TableHead>일시</TableHead>
+                  </TableRow>
+                </TableHeader>
+                <TableBody>
+                  {logs.map((log) => (
+                    <TableRow key={log.id}>
+                      <TableCell>
+                        {log.success ? (
+                          <Badge variant="success" className="gap-1">
+                            <CheckCircle className="h-3 w-3" />
+                            성공
+                          </Badge>
+                        ) : (
+                          <Badge variant="destructive" className="gap-1">
+                            <XCircle className="h-3 w-3" />
+                            실패
+                          </Badge>
+                        )}
+                      </TableCell>
+                      <TableCell>
+                        <Badge variant="outline">{log.providerName}</Badge>
+                      </TableCell>
+                      <TableCell className="font-mono text-sm">{log.modelName}</TableCell>
+                      <TableCell>
+                        <div className="flex items-center gap-1">
+                          <Zap className="text-muted-foreground h-3 w-3" />
+                          <span>{(log.totalTokens ?? 0).toLocaleString()}</span>
+                        </div>
+                        <div className="text-muted-foreground text-xs">
+                          입력: {log.promptTokens ?? 0} / 출력: {log.completionTokens ?? 0}
+                        </div>
+                      </TableCell>
+                      <TableCell>${(log.costUsd ?? 0).toFixed(6)}</TableCell>
+                      <TableCell>
+                        <div className="flex items-center gap-1">
+                          <Clock className="text-muted-foreground h-3 w-3" />
+                          <span>{log.responseTimeMs ?? 0}ms</span>
+                        </div>
+                      </TableCell>
+                      <TableCell className="text-muted-foreground">
+                        {new Date(log.createdAt).toLocaleString("ko-KR")}
+                      </TableCell>
+                    </TableRow>
+                  ))}
+                </TableBody>
+              </Table>
+              {totalPages > 1 && (
+                <div className="mt-4 flex items-center justify-center gap-2">
+                  <Button
+                    variant="outline"
+                    size="sm"
+                    onClick={() => setPage((p) => Math.max(1, p - 1))}
+                    disabled={page === 1}
+                  >
+                    이전
+                  </Button>
+                  <span className="text-muted-foreground text-sm">
+                    {page} / {totalPages}
+                  </span>
+                  <Button
+                    variant="outline"
+                    size="sm"
+                    onClick={() => setPage((p) => Math.min(totalPages, p + 1))}
+                    disabled={page === totalPages}
+                  >
+                    다음
+                  </Button>
+                </div>
+              )}
+            </>
+          )}
+        </CardContent>
+      </Card>
+    </div>
+  );
+}

frontend/app/(main)/admin/aiAssistant/layout.tsx

@@ -0,0 +1,128 @@
+"use client";
+
+import { useState, useEffect } from "react";
+import Link from "next/link";
+import {
+  getAiAssistantAuth,
+  setAiAssistantAuth,
+  loginAiAssistant,
+} from "@/lib/api/aiAssistant";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+
+export default function AIAssistantLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  const [mounted, setMounted] = useState(false);
+  const [auth, setAuth] = useState<ReturnType<typeof getAiAssistantAuth>>(null);
+  const [email, setEmail] = useState("");
+  const [password, setPassword] = useState("");
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState("");
+
+  useEffect(() => {
+    setAuth(getAiAssistantAuth());
+    setMounted(true);
+  }, []);
+
+  const handleLogin = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError("");
+    setLoading(true);
+    try {
+      await loginAiAssistant(email, password);
+      setAuth(getAiAssistantAuth());
+    } catch (err: unknown) {
+      const msg =
+        err && typeof err === "object" && "response" in err
+          ? (err as { response?: { data?: { error?: { message?: string } } } }).response?.data
+              ?.error?.message
+          : null;
+      setError(msg || "로그인에 실패했습니다.");
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const handleLogout = () => {
+    setAiAssistantAuth(null);
+    setAuth(null);
+  };
+
+  if (!mounted) {
+    return (
+      <div className="flex min-h-[40vh] items-center justify-center">
+        <p className="text-muted-foreground text-sm">로딩 중...</p>
+      </div>
+    );
+  }
+
+  if (!auth) {
+    return (
+      <div className="mx-auto flex min-h-[60vh] max-w-sm flex-col justify-center p-6">
+        <Card>
+          <CardHeader>
+            <CardTitle>AI 어시스턴트 로그인</CardTitle>
+            <CardDescription>
+              AI 서비스(API 키, 사용량, 채팅 등)를 사용하려면 로그인하세요.
+            </CardDescription>
+          </CardHeader>
+          <CardContent>
+            <form onSubmit={handleLogin} className="space-y-4">
+              <div className="space-y-2">
+                <Label htmlFor="email">이메일</Label>
+                <Input
+                  id="email"
+                  type="email"
+                  value={email}
+                  onChange={(e) => setEmail(e.target.value)}
+                  placeholder="admin@admin.com"
+                  required
+                />
+              </div>
+              <div className="space-y-2">
+                <Label htmlFor="password">비밀번호</Label>
+                <Input
+                  id="password"
+                  type="password"
+                  value={password}
+                  onChange={(e) => setPassword(e.target.value)}
+                  required
+                />
+              </div>
+              {error && (
+                <p className="text-destructive text-sm">{error}</p>
+              )}
+              <div className="flex gap-2">
+                <Button type="submit" className="flex-1" disabled={loading}>
+                  {loading ? "로그인 중..." : "로그인"}
+                </Button>
+                <Button asChild variant="outline">
+                  <Link href="/admin">취소</Link>
+                </Button>
+              </div>
+            </form>
+          </CardContent>
+        </Card>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-end gap-2 border-b pb-2 text-sm">
+        <span className="text-muted-foreground">
+          {auth.user?.name || auth.user?.email} (AI 서비스)
+        </span>
+        <Button variant="ghost" size="sm" onClick={handleLogout}>
+          로그아웃
+        </Button>
+      </div>
+      {children}
+    </div>
+  );
+}

frontend/app/(main)/admin/aiAssistant/page.tsx

@@ -0,0 +1,6 @@
+import { redirect } from "next/navigation";
+
+/** AI 어시스턴트 진입 시 대시보드로 이동 */
+export default function AIAssistantPage() {
+  redirect("/admin/aiAssistant/dashboard");
+}

frontend/app/(main)/admin/aiAssistant/usage/page.tsx

@@ -0,0 +1,195 @@
+"use client";
+
+import { useState, useEffect } from "react";
+import { aiAssistantApi } from "@/lib/api/aiAssistant";
+import type { UsageSummary } from "@/lib/api/aiAssistant";
+import { BarChart3, Calendar, Loader2, TrendingUp, Zap, DollarSign } from "lucide-react";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Progress } from "@/components/ui/progress";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { toast } from "sonner";
+
+interface DailyUsageItem {
+  date?: string;
+  totalTokens?: number;
+  requestCount?: number;
+}
+
+export default function AiAssistantUsagePage() {
+  const [loading, setLoading] = useState(true);
+  const [usage, setUsage] = useState<UsageSummary | null>(null);
+  const [dailyUsage, setDailyUsage] = useState<DailyUsageItem[]>([]);
+  const [period, setPeriod] = useState("7");
+
+  useEffect(() => {
+    loadUsage();
+  }, [period]);
+
+  const loadUsage = async () => {
+    setLoading(true);
+    try {
+      const [usageRes, dailyRes] = await Promise.all([
+        aiAssistantApi.get("/usage"),
+        aiAssistantApi.get(`/usage/daily?days=${period}`),
+      ]);
+      setUsage(usageRes.data?.data ?? null);
+      setDailyUsage((dailyRes.data?.data as { usage?: DailyUsageItem[] })?.usage ?? []);
+    } catch {
+      toast.error("사용량 데이터를 불러오는데 실패했습니다.");
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  if (loading) {
+    return (
+      <div className="flex h-64 items-center justify-center">
+        <Loader2 className="text-primary h-8 w-8 animate-spin" />
+      </div>
+    );
+  }
+
+  const todayTokens = usage?.usage?.today?.tokens ?? 0;
+  const todayRequests = usage?.usage?.today?.requests ?? 0;
+  const monthlyTokens = usage?.usage?.monthly?.totalTokens ?? 0;
+  const monthlyCost = usage?.usage?.monthly?.totalCost ?? 0;
+  const monthlyLimit = usage?.limit?.monthly ?? 0;
+  const usagePercent = monthlyLimit > 0 ? Math.round((monthlyTokens / monthlyLimit) * 100) : 0;
+  const maxTokens = Math.max(...dailyUsage.map((d) => d.totalTokens ?? 0), 1);
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-3xl font-bold tracking-tight">사용량</h1>
+        <p className="text-muted-foreground mt-1">API 사용량 및 비용을 확인합니다.</p>
+      </div>
+
+      <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
+        <Card>
+          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+            <CardTitle className="text-sm font-medium">오늘 토큰</CardTitle>
+            <Zap className="text-muted-foreground h-4 w-4" />
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold">{todayTokens.toLocaleString()}</div>
+          </CardContent>
+        </Card>
+        <Card>
+          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+            <CardTitle className="text-sm font-medium">오늘 요청</CardTitle>
+            <TrendingUp className="text-muted-foreground h-4 w-4" />
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold">{todayRequests.toLocaleString()}</div>
+          </CardContent>
+        </Card>
+        <Card>
+          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+            <CardTitle className="text-sm font-medium">이번 달 토큰</CardTitle>
+            <BarChart3 className="text-muted-foreground h-4 w-4" />
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold">{monthlyTokens.toLocaleString()}</div>
+          </CardContent>
+        </Card>
+        <Card>
+          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+            <CardTitle className="text-sm font-medium">이번 달 비용</CardTitle>
+            <DollarSign className="text-muted-foreground h-4 w-4" />
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold">${monthlyCost.toFixed(4)}</div>
+          </CardContent>
+        </Card>
+      </div>
+
+      <Card>
+        <CardHeader className="flex flex-row items-center justify-between">
+          <div>
+            <CardTitle>일별 사용량</CardTitle>
+            <CardDescription>기간별 토큰 사용량 추이</CardDescription>
+          </div>
+          <Select value={period} onValueChange={setPeriod}>
+            <SelectTrigger className="w-[140px]">
+              <Calendar className="mr-2 h-4 w-4" />
+              <SelectValue />
+            </SelectTrigger>
+            <SelectContent>
+              <SelectItem value="7">최근 7일</SelectItem>
+              <SelectItem value="14">최근 14일</SelectItem>
+              <SelectItem value="30">최근 30일</SelectItem>
+            </SelectContent>
+          </Select>
+        </CardHeader>
+        <CardContent>
+          {dailyUsage.length === 0 ? (
+            <div className="flex flex-col items-center justify-center py-12 text-center">
+              <BarChart3 className="text-muted-foreground mb-4 h-12 w-12" />
+              <p className="text-muted-foreground">사용 기록이 없습니다.</p>
+            </div>
+          ) : (
+            <div className="space-y-3">
+              {dailyUsage.map((day, idx) => (
+                <div key={day.date ?? idx} className="flex items-center gap-4">
+                  <div className="text-muted-foreground w-20 text-sm">
+                    {day.date
+                      ? new Date(day.date).toLocaleDateString("ko-KR", {
+                          month: "short",
+                          day: "numeric",
+                        })
+                      : "-"}
+                  </div>
+                  <div className="flex-1">
+                    <div className="bg-muted h-8 overflow-hidden rounded-lg">
+                      <div
+                        className="bg-primary h-full rounded-lg transition-all duration-500"
+                        style={{
+                          width: `${((day.totalTokens ?? 0) / maxTokens) * 100}%`,
+                        }}
+                      />
+                    </div>
+                  </div>
+                  <div className="w-28 text-right">
+                    <span className="text-sm font-medium">
+                      {(day.totalTokens ?? 0).toLocaleString()}
+                    </span>
+                    <span className="text-muted-foreground ml-1 text-xs">토큰</span>
+                  </div>
+                  <div className="text-muted-foreground w-16 text-right text-sm">
+                    {day.requestCount ?? 0}회
+                  </div>
+                </div>
+              ))}
+            </div>
+          )}
+        </CardContent>
+      </Card>
+
+      <Card className="bg-gradient-to-r from-primary to-primary/80 text-primary-foreground">
+        <CardContent className="pt-6">
+          <div className="mb-4 flex items-center justify-between">
+            <div>
+              <h3 className="text-lg font-semibold">
+                현재 플랜: {(usage?.plan ?? "FREE").toUpperCase()}
+              </h3>
+              <p className="text-primary-foreground/70">
+                월간 한도: {monthlyLimit > 0 ? monthlyLimit.toLocaleString() : "무제한"} 토큰
+              </p>
+            </div>
+            <div className="text-right">
+              <p className="text-3xl font-bold">{usagePercent}%</p>
+              <p className="text-primary-foreground/70 text-sm">사용률</p>
+            </div>
+          </div>
+          <Progress value={usagePercent} className="bg-primary-foreground/20 h-3" />
+        </CardContent>
+      </Card>
+    </div>
+  );
+}

frontend/app/(main)/admin/page.tsx

@@ -1,4 +1,4 @@
-import { Users, Shield, Settings, BarChart3, Palette, Layout, Database, Package, Building2 } from "lucide-react";
+import { Users, Shield, Settings, BarChart3, Palette, Layout, Database, Package, Building2, Bot } from "lucide-react";
 import Link from "next/link";
 import { GlobalFileViewer } from "@/components/GlobalFileViewer";
 
@@ -80,6 +80,20 @@ export default function AdminPage() {
                 </div>
               </div>
             </Link>
+
+            <Link href="/admin/aiAssistant" className="block">
+              <div className="bg-card hover:bg-muted rounded-lg border p-6 shadow-sm transition-colors">
+                <div className="flex items-center gap-4">
+                  <div className="bg-primary/10 flex h-12 w-12 items-center justify-center rounded-lg">
+                    <Bot className="text-primary h-6 w-6" />
+                  </div>
+                  <div>
+                    <h3 className="text-foreground font-semibold">AI 어시스턴트</h3>
+                    <p className="text-muted-foreground text-sm">AI 채팅 및 LLM 연동 관리</p>
+                  </div>
+                </div>
+              </div>
+            </Link>
           </div>
         </div>
 

frontend/app/(main)/admin/screenMng/barcodeList/page.tsx

@@ -6,12 +6,15 @@ import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { BarcodeListTable } from "@/components/barcode/BarcodeListTable";
-import { Plus, Search, RotateCcw } from "lucide-react";
+import { BarcodeScanModal } from "@/components/common/BarcodeScanModal";
+import { Plus, Search, RotateCcw, Scan } from "lucide-react";
 import { useBarcodeList } from "@/hooks/useBarcodeList";
 
 export default function BarcodeLabelManagementPage() {
   const router = useRouter();
   const [searchText, setSearchText] = useState("");
+  const [scanModalOpen, setScanModalOpen] = useState(false);
+  const [scannedBarcode, setScannedBarcode] = useState<string | null>(null);
 
   const { labels, total, page, limit, isLoading, refetch, setPage, handleSearch } = useBarcodeList();
 
@@ -74,6 +77,33 @@ export default function BarcodeLabelManagementPage() {
           </CardContent>
         </Card>
 
+        {/* 카메라 스캔: 바코드 값을 텍스트로 추출해 표시 */}
+        <Card className="shadow-sm">
+          <CardHeader className="bg-gray-50/50">
+            <CardTitle className="flex items-center gap-2">
+              <Scan className="h-5 w-5" />
+              바코드 스캔
+            </CardTitle>
+            <p className="text-muted-foreground text-sm">
+              카메라로 바코드를 스캔하면 추출된 값을 아래에 텍스트로 표시합니다.
+            </p>
+          </CardHeader>
+          <CardContent className="space-y-4">
+            <Button onClick={() => setScanModalOpen(true)} variant="outline" className="gap-2">
+              <Scan className="h-4 w-4" />
+              카메라로 바코드 스캔
+            </Button>
+            {scannedBarcode ? (
+              <div className="rounded-lg border bg-muted/30 p-4">
+                <p className="text-muted-foreground mb-1 text-sm">추출된 바코드 값</p>
+                <p className="font-mono text-lg font-semibold break-all">{scannedBarcode}</p>
+              </div>
+            ) : (
+              <p className="text-muted-foreground text-sm">아직 스캔한 바코드가 없습니다. 위 버튼으로 스캔해 보세요.</p>
+            )}
+          </CardContent>
+        </Card>
+
         <Card className="shadow-sm">
           <CardHeader className="bg-gray-50/50">
             <CardTitle className="flex items-center justify-between">
@@ -95,6 +125,18 @@ export default function BarcodeLabelManagementPage() {
             />
           </CardContent>
         </Card>
+
+        <BarcodeScanModal
+          open={scanModalOpen}
+          onOpenChange={setScanModalOpen}
+          targetField="바코드 값"
+          barcodeFormat="all"
+          autoSubmit={false}
+          onScanSuccess={(barcode) => {
+            setScannedBarcode(barcode);
+            setScanModalOpen(false);
+          }}
+        />
       </div>
     </div>
   );

frontend/components/barcode/designer/BarcodeDesignerCanvas.tsx

@@ -1,14 +1,20 @@
 "use client";
 
-import { useRef } from "react";
+import { useRef, useState, useEffect } from "react";
 import { useDrop } from "react-dnd";
 import { useBarcodeDesigner, MM_TO_PX } from "@/contexts/BarcodeDesignerContext";
 import { BarcodeLabelCanvasComponent } from "./BarcodeLabelCanvasComponent";
 import { BarcodeLabelComponent } from "@/types/barcode";
 import { v4 as uuidv4 } from "uuid";
 
+/** 작업 영역에 라벨이 들어가도록 스케일 (최소 0.5=작게 맞춤, 최대 3) */
+const MIN_SCALE = 0.5;
+const MAX_SCALE = 3;
+
 export function BarcodeDesignerCanvas() {
+  const containerRef = useRef<HTMLDivElement>(null);
   const canvasRef = useRef<HTMLDivElement>(null);
+  const [scale, setScale] = useState(1);
   const {
     widthMm,
     heightMm,
@@ -22,17 +28,45 @@ export function BarcodeDesignerCanvas() {
   const widthPx = widthMm * MM_TO_PX;
   const heightPx = heightMm * MM_TO_PX;
 
+  // 컨테이너 크기에 맞춰 캔버스 스케일 계산 (라벨이 너무 작게 보이지 않도록)
+  useEffect(() => {
+    const el = containerRef.current;
+    if (!el || widthPx <= 0 || heightPx <= 0) return;
+    const observer = new ResizeObserver(() => {
+      const w = el.clientWidth - 48;
+      const h = el.clientHeight - 48;
+      if (w <= 0 || h <= 0) return;
+      const scaleX = w / widthPx;
+      const scaleY = h / heightPx;
+      const fitScale = Math.min(scaleX, scaleY);
+      const s = Math.max(MIN_SCALE, Math.min(MAX_SCALE, fitScale));
+      setScale(s);
+    });
+    observer.observe(el);
+    const w = el.clientWidth - 48;
+    const h = el.clientHeight - 48;
+    if (w > 0 && h > 0) {
+      const scaleX = w / widthPx;
+      const scaleY = h / heightPx;
+      const fitScale = Math.min(scaleX, scaleY);
+      const s = Math.max(MIN_SCALE, Math.min(MAX_SCALE, fitScale));
+      setScale(s);
+    }
+    return () => observer.disconnect();
+  }, [widthPx, heightPx]);
+
   const [{ isOver }, drop] = useDrop(() => ({
     accept: "barcode-component",
     drop: (item: { component: BarcodeLabelComponent }, monitor) => {
-      if (!canvasRef.current) return;
+      const canvasEl = canvasRef.current;
+      if (!canvasEl) return;
       const offset = monitor.getClientOffset();
-      const rect = canvasRef.current.getBoundingClientRect();
+      const rect = canvasEl.getBoundingClientRect();
       if (!offset) return;
-
-      let x = offset.x - rect.left;
-      let y = offset.y - rect.top;
-      // 드롭 시 요소 중앙이 커서에 오도록 보정
+      // 스케일 적용된 좌표 → 실제 캔버스 좌표
+      const s = scale;
+      let x = (offset.x - rect.left) / s;
+      let y = (offset.y - rect.top) / s;
       x -= item.component.width / 2;
       y -= item.component.height / 2;
       x = Math.max(0, Math.min(x, widthPx - item.component.width));
@@ -48,36 +82,56 @@ export function BarcodeDesignerCanvas() {
       addComponent(newComp);
     },
     collect: (m) => ({ isOver: m.isOver() }),
-  }), [widthPx, heightPx, components.length, addComponent, snapValueToGrid]);
+  }), [widthPx, heightPx, scale, components.length, addComponent, snapValueToGrid]);
+
+  // 스케일된 캔버스가 컨테이너 안에 들어가도록 fit (하단 잘림 방지)
+  const scaledW = widthPx * scale;
+  const scaledH = heightPx * scale;
 
   return (
-    <div className="flex flex-1 items-center justify-center overflow-auto bg-gray-100 p-6">
+    <div
+      ref={containerRef}
+      className="flex min-h-0 flex-1 items-center justify-center overflow-auto bg-gray-100 p-6"
+    >
+      {/* 래퍼: 스케일된 크기만큼 차지해서 flex로 정확히 가운데 + 하단 잘림 방지 */}
       <div
-        key={`canvas-${widthMm}-${heightMm}`}
-        ref={(r) => {
-          (canvasRef as any).current = r;
-          drop(r);
-        }}
-        className="relative bg-white shadow-lg"
-        style={{
-          width: widthPx,
-          height: heightPx,
-          minWidth: widthPx,
-          minHeight: heightPx,
-          backgroundImage: showGrid
-            ? `linear-gradient(to right, #e5e7eb 1px, transparent 1px),
-               linear-gradient(to bottom, #e5e7eb 1px, transparent 1px)`
-            : undefined,
-          backgroundSize: showGrid ? `${MM_TO_PX * 5}px ${MM_TO_PX * 5}px` : undefined,
-          outline: isOver ? "2px dashed #2563eb" : "1px solid #d1d5db",
-        }}
-        onClick={(e) => {
-          if (e.target === e.currentTarget) selectComponent(null);
-        }}
+        className="flex shrink-0 items-center justify-center"
+        style={{ width: scaledW, height: scaledH }}
       >
-        {components.map((c) => (
-          <BarcodeLabelCanvasComponent key={c.id} component={c} />
-        ))}
+        <div
+          style={{
+            transform: `scale(${scale})`,
+            transformOrigin: "0 0",
+          }}
+        >
+          <div
+            key={`canvas-${widthMm}-${heightMm}`}
+            ref={(r) => {
+              (canvasRef as { current: HTMLDivElement | null }).current = r;
+              drop(r);
+            }}
+            className="relative bg-white shadow-lg"
+            style={{
+              width: widthPx,
+              height: heightPx,
+              minWidth: widthPx,
+              minHeight: heightPx,
+              backgroundImage: showGrid
+                ? `linear-gradient(to right, #e5e7eb 1px, transparent 1px),
+                   linear-gradient(to bottom, #e5e7eb 1px, transparent 1px)`
+                : undefined,
+              backgroundSize: showGrid ? `${MM_TO_PX * 5}px ${MM_TO_PX * 5}px` : undefined,
+              outline: isOver ? "2px dashed #2563eb" : "1px solid #d1d5db",
+            }}
+            onClick={(e) => {
+              if (e.target === e.currentTarget) selectComponent(null);
+            }}
+          >
+            {components.map((c) => (
+              <BarcodeLabelCanvasComponent key={c.id} component={c} />
+            ))}
+          </div>
+        </div>
       </div>
     </div>
   );

frontend/components/barcode/designer/BarcodeDesignerLeftPanel.tsx

@@ -6,7 +6,7 @@ import { BarcodeComponentPalette } from "./BarcodeComponentPalette";
 
 export function BarcodeDesignerLeftPanel() {
   return (
-    <div className="flex min-h-0 w-64 shrink-0 flex-col overflow-hidden border-r bg-white">
+    <div className="flex min-h-0 w-72 shrink-0 flex-col overflow-hidden border-r bg-white">
       <div className="min-h-0 flex-1 overflow-hidden">
         <ScrollArea className="h-full">
           <div className="space-y-4 p-4">

frontend/components/barcode/designer/BarcodeTemplatePalette.tsx

@@ -114,11 +114,13 @@ export function BarcodeTemplatePalette() {
                   key={t.template_id}
                   variant="outline"
                   size="sm"
-                  className="h-auto w-full justify-start py-1.5 text-left"
+                  className="h-auto w-full justify-start px-2 py-1.5 text-left"
                   onClick={() => applyTemplate(t.template_id)}
                 >
-                  <span className="truncate">{t.template_name_kor}</span>
-                  <span className="text-muted-foreground ml-1 shrink-0 text-xs">
+                  <span className="block break-words text-left text-xs leading-tight">
+                    {t.template_name_kor}
+                  </span>
+                  <span className="text-muted-foreground mt-0.5 block text-[10px]">
                     {t.width_mm}×{t.height_mm}
                   </span>
                 </Button>

frontend/components/common/BarcodeScanModal.tsx

@@ -46,7 +46,6 @@ export const BarcodeScanModal: React.FC<BarcodeScanModalProps> = ({
   useEffect(() => {
     if (open) {
       codeReaderRef.current = new BrowserMultiFormatReader();
-      // 자동 권한 요청 제거 - 사용자가 버튼을 클릭해야 권한 요청
     }
 
     return () => {
@@ -184,7 +183,7 @@ export const BarcodeScanModal: React.FC<BarcodeScanModalProps> = ({
         <DialogHeader>
           <DialogTitle className="text-base sm:text-lg">바코드 스캔</DialogTitle>
           <DialogDescription className="text-xs sm:text-sm">
-            카메라로 바코드를 스캔하세요.
+            카메라로 바코드를 스캔합니다.
             {targetField && ` (대상 필드: ${targetField})`}
           </DialogDescription>
         </DialogHeader>

frontend/components/layout/MainSidebar.tsx

@@ -1,4 +1,4 @@
-import { ChevronDown, ChevronRight, Home, FileText, Users, BarChart3, Cog, GitBranch } from "lucide-react";
+import { ChevronDown, ChevronRight, Home, FileText, Users, BarChart3, Cog, GitBranch, Bot } from "lucide-react";
 import { cn } from "@/lib/utils";
 import { MenuItem } from "@/types/menu";
 import { MENU_ICONS, MESSAGES } from "@/constants/layout";
@@ -32,6 +32,9 @@ const getMenuIcon = (menuName: string) => {
   if (MENU_ICONS.DATAFLOW.some((keyword) => menuName.includes(keyword))) {
     return <GitBranch className="h-4 w-4" />;
   }
+  if (MENU_ICONS.AI.some((keyword) => menuName.includes(keyword))) {
+    return <Bot className="h-4 w-4" />;
+  }
   return <FileText className="h-4 w-4" />;
 };
 

frontend/components/ui/badge.tsx

@@ -12,6 +12,8 @@ const badgeVariants = cva(
         secondary: "border-transparent bg-secondary text-secondary-foreground hover:bg-secondary/80",
         destructive: "border-transparent bg-destructive text-destructive-foreground hover:bg-destructive/80",
         outline: "text-foreground",
+        success: "border-transparent bg-green-500 text-white hover:bg-green-600",
+        warning: "border-transparent bg-yellow-500 text-white hover:bg-yellow-600",
       },
     },
     defaultVariants: {

frontend/constants/layout.ts

@@ -41,4 +41,5 @@ export const MENU_ICONS = {
   STATISTICS: ["통계", "분석", "리포트", "차트"],
   SETTINGS: ["설정", "관리", "시스템"],
   DATAFLOW: ["데이터", "흐름", "관계", "연결"],
+  AI: ["AI", "어시스턴트", "챗봇", "LLM"],
 } as const;

frontend/docs/AI_어시스턴트_메뉴_등록_가이드.md

@@ -0,0 +1,50 @@
+# AI 어시스턴트 메뉴 등록 가이드 (VEXPLOR)
+
+AI 어시스턴트는 **VEXPLOR와 같은 서비스/같은 포트**로 동작합니다.  
+프론트는 `/api/ai/v1` 로 호출하고, backend-node가 AI 서비스(기본 3100 포트)로 프록시합니다.
+
+## 서비스 기동
+
+- **AI API**: `ERP-node/ai-assistant` 에서 `npm install` 후 `npm start` (포트 3100)
+- **backend-node**: `npm run dev` (8080)
+- **frontend**: `npm run dev` (9771)
+
+별도 포트/도메인 설정 없이 브라우저에서는 **localhost:9771** 만 사용하면 됩니다.
+
+---
+
+## VEXPLOR 메뉴 URL 목록 (전체 탑재)
+
+대메뉴 예: **AI 서비스** / **AI**  
+소메뉴는 아래 표의 **메뉴명**과 **URL**로 등록하면 됩니다. (메뉴명에 "AI", "어시스턴트", "챗봇", "LLM" 포함 시 사이드바에 Bot 아이콘 표시)
+
+### 일반 메뉴
+
+| 메뉴명       | URL (메뉴 관리에 입력할 값)   |
+|-------------|-------------------------------|
+| AI 채팅     | /admin/aiAssistant/chat       |
+| 대시보드    | /admin/aiAssistant/dashboard  |
+| API 키 관리 | /admin/aiAssistant/api-keys   |
+| API 테스트  | /admin/aiAssistant/api-test   |
+| 내 사용량   | /admin/aiAssistant/usage       |
+| 대화 이력   | /admin/aiAssistant/history    |
+| 설정        | /admin/aiAssistant/settings    |
+
+### 관리자 메뉴
+
+| 메뉴명           | URL (메뉴 관리에 입력할 값)        |
+|------------------|------------------------------------|
+| 사용자 관리      | /admin/aiAssistant/admin/users     |
+| LLM 관리         | /admin/aiAssistant/admin/providers  |
+| LLM 사용량 통계  | /admin/aiAssistant/admin/usage-stats |
+
+---
+
+## 등록 순서 예시
+
+1. **대메뉴**: 메뉴명 `AI 서비스`, URL은 비우거나 `#` (자식만 사용할 경우)
+2. **소메뉴**: 위 표에서 필요한 것만 추가
+   - 예: 메뉴명 `대시보드`, URL `/admin/aiAssistant/dashboard`
+   - 예: 메뉴명 `API 키 관리`, URL `/admin/aiAssistant/api-keys`
+
+이렇게 등록하면 VEXPLOR 사이드바에서 각 메뉴 클릭 시 해당 AI 어시스턴트 화면이 열립니다.

frontend/lib/api/aiAssistant/client.ts

@@ -0,0 +1,127 @@
+/**
+ * AI 어시스턴트 전용 API 클라이언트
+ * - VEXPLOR와 같은 서비스/같은 포트: /api/ai/v1 로 호출 (Next → backend-node → AI 서비스 프록시)
+ * - 인증 토큰은 sessionStorage 'ai-assistant-auth' 사용 (VEXPLOR 인증과 분리)
+ */
+import axios, { AxiosError } from "axios";
+import type { AiAssistantAuthState } from "./types";
+
+const STORAGE_KEY = "ai-assistant-auth";
+
+/** 같은 오리진 기준 AI API prefix (backend-node가 /api/ai/v1 을 AI 서비스로 프록시) */
+function getBaseUrl(): string {
+  if (typeof window === "undefined") return "";
+  return "/api/ai/v1";
+}
+
+export function getAiAssistantAuth(): AiAssistantAuthState | null {
+  if (typeof window === "undefined") return null;
+  try {
+    const raw = sessionStorage.getItem(STORAGE_KEY);
+    return raw ? (JSON.parse(raw) as AiAssistantAuthState) : null;
+  } catch {
+    return null;
+  }
+}
+
+export function setAiAssistantAuth(state: AiAssistantAuthState | null): void {
+  if (typeof window === "undefined") return;
+  if (state) sessionStorage.setItem(STORAGE_KEY, JSON.stringify(state));
+  else sessionStorage.removeItem(STORAGE_KEY);
+}
+
+export function getAiAssistantAccessToken(): string | null {
+  return getAiAssistantAuth()?.accessToken ?? null;
+}
+
+let refreshing = false;
+const queue: Array<{ resolve: (t: string) => void; reject: (e: unknown) => void }> = [];
+
+function processQueue(error: unknown, token: string | null) {
+  queue.forEach((p) => (error ? p.reject(error) : p.resolve(token!)));
+  queue.length = 0;
+}
+
+const client = axios.create({
+  baseURL: "",
+  headers: { "Content-Type": "application/json" },
+});
+
+client.interceptors.request.use((config) => {
+  const base = getBaseUrl();
+  if (base) config.baseURL = base;
+  const token = getAiAssistantAccessToken();
+  if (token) config.headers.Authorization = `Bearer ${token}`;
+  return config;
+});
+
+client.interceptors.response.use(
+  (res) => res,
+  async (err: AxiosError) => {
+    const original = err.config as typeof err.config & { _retry?: boolean };
+    const isAuth = original?.url?.includes("/auth/");
+    if (isAuth || err.response?.status !== 401 || original?._retry) {
+      return Promise.reject(err);
+    }
+
+    if (refreshing) {
+      return new Promise<string>((resolve, reject) => {
+        queue.push({ resolve, reject });
+      })
+        .then((token) => {
+          if (original.headers) original.headers.Authorization = `Bearer ${token}`;
+          return client(original);
+        })
+        .catch((e) => Promise.reject(e));
+    }
+
+    original._retry = true;
+    refreshing = true;
+    const auth = getAiAssistantAuth();
+    try {
+      if (!auth?.refreshToken) throw new Error("No refresh token");
+      const base = getBaseUrl();
+      const { data } = await axios.post<{ data: { accessToken: string } }>(
+        `${base}/auth/refresh`,
+        { refreshToken: auth.refreshToken },
+        { headers: { "Content-Type": "application/json" } },
+      );
+      const newToken = data?.data?.accessToken;
+      if (!newToken) throw new Error("No access token");
+      const newState: AiAssistantAuthState = {
+        ...auth,
+        accessToken: newToken,
+      };
+      setAiAssistantAuth(newState);
+      processQueue(null, newToken);
+      if (original.headers) original.headers.Authorization = `Bearer ${newToken}`;
+      return client(original);
+    } catch (e) {
+      processQueue(e, null);
+      setAiAssistantAuth(null);
+      return Promise.reject(err);
+    } finally {
+      refreshing = false;
+    }
+  },
+);
+
+/** AI 어시스턴트 로그인 (이메일/비밀번호) */
+export async function loginAiAssistant(
+  email: string,
+  password: string,
+): Promise<AiAssistantAuthState> {
+  const base = getBaseUrl();
+  const { data } = await axios.post<{
+    data: { user: AiAssistantAuthState["user"]; accessToken: string; refreshToken: string };
+  }>(`${base}/auth/login`, { email, password }, { headers: { "Content-Type": "application/json" }, withCredentials: true });
+  const state: AiAssistantAuthState = {
+    user: data.data.user,
+    accessToken: data.data.accessToken,
+    refreshToken: data.data.refreshToken,
+  };
+  setAiAssistantAuth(state);
+  return state;
+}
+
+export default client;

frontend/lib/api/aiAssistant/index.ts

@@ -0,0 +1,8 @@
+export { default as aiAssistantApi } from "./client";
+export {
+  getAiAssistantAuth,
+  setAiAssistantAuth,
+  getAiAssistantAccessToken,
+  loginAiAssistant,
+} from "./client";
+export * from "./types";

frontend/lib/api/aiAssistant/types.ts

@@ -0,0 +1,70 @@
+/**
+ * AI 어시스턴트 API 응답/요청 타입 (workspace_assistant 백엔드 연동)
+ */
+
+export interface AiAssistantUser {
+  id: number;
+  email: string;
+  name: string;
+  role: "user" | "admin";
+  status?: string;
+  plan?: string;
+  monthlyTokenLimit?: number;
+  createdAt?: string;
+}
+
+export interface AiAssistantAuthState {
+  user: AiAssistantUser;
+  accessToken: string;
+  refreshToken: string;
+}
+
+export interface UsageSummary {
+  usage?: {
+    today?: { tokens?: number; requests?: number };
+    monthly?: { totalTokens?: number; totalCost?: number };
+  };
+  limit?: { monthly?: number };
+  plan?: string;
+}
+
+export interface ApiKeyItem {
+  id: number;
+  name: string;
+  keyPrefix: string;
+  status: string;
+  usageCount?: number;
+  lastUsedAt?: string | null;
+  createdAt: string;
+}
+
+export interface UsageLogItem {
+  id: number;
+  success: boolean;
+  providerName?: string;
+  modelName?: string;
+  promptTokens?: number;
+  completionTokens?: number;
+  totalTokens?: number;
+  costUsd?: number;
+  responseTimeMs?: number;
+  createdAt: string;
+}
+
+export interface AdminStats {
+  users?: { total?: number; active?: number };
+  apiKeys?: { total?: number };
+  providers?: { active?: number };
+}
+
+export interface LlmProvider {
+  id: number;
+  displayName: string;
+  modelName: string;
+  apiKey?: string;
+  priority: number;
+  maxTokens?: number;
+  temperature?: number;
+  isActive: boolean;
+  costPer1kInputTokens?: number;
+}

frontend/next.config.mjs

@@ -20,11 +20,9 @@ const nextConfig = {
   },
 
   // API 프록시 설정 - 백엔드로 요청 전달
-  // Docker 환경: 컨테이너 이름(pms-backend-mac) 또는 SERVER_API_URL 사용
-  // 로컬 개발: http://127.0.0.1:8080 사용
+  // Docker: SERVER_API_URL 사용. 로컬: 127.0.0.1 사용 (localhost는 IPv6 ::1 로 해석되어 ECONNREFUSED 나는 경우 있음)
   async rewrites() {
-    // Docker 컨테이너 내부에서는 컨테이너 이름으로 통신
-    const backendUrl = process.env.SERVER_API_URL || "http://localhost:8080";
+    const backendUrl = process.env.SERVER_API_URL || "http://127.0.0.1:8080";
     return [
       {
         source: "/api/:path*",

start-windows-simple.bat

@@ -73,6 +73,7 @@ echo.
 echo 📱 접속 정보:
 echo   • 프론트엔드: http://localhost:9771
 echo   • 백엔드 API: http://localhost:8080/api
+echo   • AI 어시스턴트: 백엔드와 함께 기동됨 (로그인: admin@admin.com / Admin123!)
 echo   • 데이터베이스: 39.117.244.52:11132
 echo.
 echo 📊 서비스 상태 확인: