fix: screen_menu_assignments를 통해 메뉴별 테이블 조회

❌ 문제:
- screen_definitions 테이블에 menu_objid 컬럼이 없음
- SQL 쿼리 실행 실패 (500 에러)

✅ 수정:
- screen_menu_assignments와 screen_definitions를 JOIN하여 조회
- menu_objid → screen_id → table_name 경로로 데이터 조회

🎯 쿼리 구조:
SELECT DISTINCT sd.table_name
FROM screen_menu_assignments sma
INNER JOIN screen_definitions sd ON sma.screen_id = sd.screen_id
WHERE sma.menu_objid = ANY($1)
  AND sma.company_code = $2
  AND sd.table_name IS NOT NULL

backend-node/src/controllers/tableManagementController.ts

@@ -1634,11 +1634,12 @@ export async function getCategoryColumnsByMenu(
     const pool = getPool();
     
     const tablesQuery = `
-      SELECT DISTINCT table_name
-      FROM screen_definitions
-      WHERE menu_objid = ANY($1)
-        AND company_code = $2
-        AND table_name IS NOT NULL
+      SELECT DISTINCT sd.table_name
+      FROM screen_menu_assignments sma
+      INNER JOIN screen_definitions sd ON sma.screen_id = sd.screen_id
+      WHERE sma.menu_objid = ANY($1)
+        AND sma.company_code = $2
+        AND sd.table_name IS NOT NULL
     `;
     
     const tablesResult = await pool.query(tablesQuery, [siblingObjids, companyCode]);