feat: Add category reference to ColumnSettings interface

- Introduced a new optional property `categoryRef` to the `ColumnSettings` interface in `tableManagement.ts`, allowing for better handling of category references in table configurations.

backend-node/src/types/tableManagement.ts

@@ -44,6 +44,7 @@ export interface ColumnSettings {
   displayColumn?: string; // 🎯 Entity 조인에서 표시할 컬럼명
   displayOrder?: number; // 표시 순서
   isVisible?: boolean; // 표시 여부
+  categoryRef?: string | null; // 카테고리 참조
 }
 
 export interface TableLabels {