조인테이블의 컬럼 사용할 수 있도록 수정

frontend/lib/api/entityJoin.ts

@@ -62,6 +62,11 @@ export const entityJoinApi = {
       sortBy?: string;
       sortOrder?: "asc" | "desc";
       enableEntityJoin?: boolean;
+      additionalJoinColumns?: Array<{
+        sourceTable: string;
+        sourceColumn: string;
+        joinAlias: string;
+      }>;
     } = {},
   ): Promise<EntityJoinResponse> => {
     const searchParams = new URLSearchParams();
@@ -87,6 +92,7 @@ export const entityJoinApi = {
       params: {
         ...params,
         search: params.search ? JSON.stringify(params.search) : undefined,
+        additionalJoinColumns: params.additionalJoinColumns ? JSON.stringify(params.additionalJoinColumns) : undefined,
       },
     });
     return response.data.data;
@@ -153,6 +159,40 @@ export const entityJoinApi = {
     await apiClient.delete(`/table-management/cache`, { params });
   },
 
+  /**
+   * Entity 조인된 테이블의 추가 컬럼 목록 조회 (화면편집기용)
+   */
+  getEntityJoinColumns: async (
+    tableName: string,
+  ): Promise<{
+    tableName: string;
+    joinTables: Array<{
+      tableName: string;
+      currentDisplayColumn: string;
+      availableColumns: Array<{
+        columnName: string;
+        columnLabel: string;
+        dataType: string;
+        description?: string;
+      }>;
+    }>;
+    availableColumns: Array<{
+      tableName: string;
+      columnName: string;
+      columnLabel: string;
+      dataType: string;
+      joinAlias: string;
+      suggestedLabel: string;
+    }>;
+    summary: {
+      totalJoinTables: number;
+      totalAvailableColumns: number;
+    };
+  }> => {
+    const response = await apiClient.get(`/table-management/tables/${tableName}/entity-join-columns`);
+    return response.data.data;
+  },
+
   /**
    * 공통 참조 테이블 자동 캐싱
    */