TypeScript 오류 수정 및 Merge conflict 해결

- dataflowControlService.ts: condition.field non-null assertion 추가
- batchExternalDbService.ts: connection 속성들 non-null assertion 추가, error 타입 unknown으로 변경
- multiConnectionQueryService.ts: connection, schemaResult.data non-null assertion 추가
- dataflowExecutionController.ts: 도달할 수 없는 코드 제거
- TableListComponent.tsx, SingleTableWithSticky.tsx: merge conflict 마커 제거
- 모든 TypeScript 컴파일 오류 해결 완료

frontend/lib/registry/components/table-list/SingleTableWithSticky.tsx

@@ -88,11 +88,7 @@ export const SingleTableWithSticky: React.FC<SingleTableWithStickyProps> = ({
                       ? "h-12 border-0 px-6 py-4 text-center align-middle"
                       : "h-12 cursor-pointer border-0 px-6 py-4 text-left align-middle font-semibold whitespace-nowrap text-gray-700 select-none transition-all duration-200 hover:text-gray-900",
                     `text-${column.align}`,
-<<<<<<< HEAD
-                    column.sortable && "hover:bg-orange-50 hover:text-orange-700",
-=======
                     column.sortable && "hover:bg-orange-200/70",
->>>>>>> 8c19d57ced949bde4c9ffcce6544791d3e4b051f
                     // 고정 컬럼 스타일
                     column.fixed === "left" && "sticky z-10 border-r border-gray-200/40 bg-gradient-to-r from-slate-50/90 to-gray-50/70 shadow-sm",
                     column.fixed === "right" && "sticky z-10 border-l border-gray-200/40 bg-gradient-to-r from-slate-50/90 to-gray-50/70 shadow-sm",

frontend/lib/registry/components/table-list/TableListComponent.tsx

@@ -1329,11 +1329,7 @@ export const TableListComponent: React.FC<TableListComponentProps> = ({
       {/* 헤더 */}
       {tableConfig.showHeader && (
         <div
-<<<<<<< HEAD
-          className="flex items-center justify-between border-b border-gray-200 bg-gray-100 px-6 py-4"
-=======
           className="flex items-center justify-between border-b border-gray-200/40 bg-gradient-to-r from-slate-50/80 to-gray-50/60 px-6 py-5"
->>>>>>> 8c19d57ced949bde4c9ffcce6544791d3e4b051f
           style={{
             width: "100%",
             maxWidth: "100%",