feat: Enhance entity join functionality with company code support

- Updated the EntityJoinController to log the company code during entity join configuration retrieval.
- Modified the entityJoinService to accept company code as a parameter, allowing for company-specific entity join detection.
- Enhanced the TableManagementService to pass the company code when detecting entity joins and retrieving reference table columns.
- Implemented a helper function in the SplitPanelLayoutComponent to extract additional join columns based on the entity join configuration.
- Improved the SplitPanelLayoutConfigPanel to display entity join columns dynamically, enhancing user experience and functionality.

backend-node/src/controllers/entityJoinController.ts

@@ -193,10 +193,11 @@ export class EntityJoinController {
   async getEntityJoinConfigs(req: Request, res: Response): Promise<void> {
     try {
       const { tableName } = req.params;
+      const companyCode = (req as any).user?.companyCode;
 
-      logger.info(`Entity 조인 설정 조회: ${tableName}`);
+      logger.info(`Entity 조인 설정 조회: ${tableName} (companyCode: ${companyCode})`);
 
-      const joinConfigs = await entityJoinService.detectEntityJoins(tableName);
+      const joinConfigs = await entityJoinService.detectEntityJoins(tableName, undefined, companyCode);
 
       res.status(200).json({
         success: true,
@@ -224,11 +225,12 @@ export class EntityJoinController {
   async getReferenceTableColumns(req: Request, res: Response): Promise<void> {
     try {
       const { tableName } = req.params;
+      const companyCode = (req as any).user?.companyCode;
 
-      logger.info(`참조 테이블 컬럼 조회: ${tableName}`);
+      logger.info(`참조 테이블 컬럼 조회: ${tableName} (companyCode: ${companyCode})`);
 
       const columns =
-        await tableManagementService.getReferenceTableColumns(tableName);
+        await tableManagementService.getReferenceTableColumns(tableName, companyCode);
 
       res.status(200).json({
         success: true,
@@ -408,11 +410,12 @@ export class EntityJoinController {
   async getEntityJoinColumns(req: Request, res: Response): Promise<void> {
     try {
       const { tableName } = req.params;
+      const companyCode = (req as any).user?.companyCode;
 
-      logger.info(`Entity 조인 컬럼 조회: ${tableName}`);
+      logger.info(`Entity 조인 컬럼 조회: ${tableName} (companyCode: ${companyCode})`);
 
       // 1. 현재 테이블의 Entity 조인 설정 조회
-      const allJoinConfigs = await entityJoinService.detectEntityJoins(tableName);
+      const allJoinConfigs = await entityJoinService.detectEntityJoins(tableName, undefined, companyCode);
       
       // 🆕 화면 디자이너용: table_column_category_values는 카테고리 드롭다운용이므로 제외
       // 카테고리 값은 엔티티 조인 컬럼이 아니라 셀렉트박스 옵션으로 사용됨
@@ -439,7 +442,7 @@ export class EntityJoinController {
           try {
             const columns =
               await tableManagementService.getReferenceTableColumns(
-                config.referenceTable
+                config.referenceTable, companyCode
               );
 
             // 현재 display_column 정보 (참고용으로만 사용, 필터링하지 않음)