refactor: Enhance unique constraint validation across data operations

- Integrated `TableManagementService` to validate unique constraints before insert, update, and upsert actions in various controllers, including `dataflowExecutionController`, `dynamicFormController`, and `tableManagementController`.
- Improved error handling in `errorHandler` to provide detailed messages indicating which field has a unique constraint violation.
- Updated the `formatPgError` utility to extract and display specific column labels for unique constraint violations, enhancing user feedback.
- Adjusted the table schema retrieval to include company-specific nullable and unique constraints, ensuring accurate representation of database rules.

These changes improve data integrity by preventing duplicate entries and enhance user experience through clearer error messages related to unique constraints.

frontend/lib/registry/components/v2-table-search-widget/TableSearchWidget.tsx

@@ -467,14 +467,9 @@ export function TableSearchWidget({ component, screenId, onHeightChange }: Table
 
       if (hasNewOptions) {
         setSelectOptions((prev) => {
-          // 이미 로드된 옵션은 유지, 새로 로드된 옵션만 병합
-          const merged = { ...prev };
-          for (const [key, value] of Object.entries(loadedOptions)) {
-            if (!merged[key] || merged[key].length === 0) {
-              merged[key] = value;
-            }
-          }
-          return merged;
+          // 새로 로드된 옵션으로 항상 갱신 (카테고리 label 정보가 나중에 로드될 수 있으므로)
+          // 로드 실패한 컬럼의 기존 옵션은 유지
+          return { ...prev, ...loadedOptions };
         });
       }
     };