feat: enhance v2 components and entity join functionality

- Add entity join controller/routes enhancements
- Improve table management and category value services
- Update v2 table list, card display, search widget components
- Improve split panel layout responsiveness

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/lib/registry/components/split-panel-layout2/SplitPanelLayout2Component.tsx

@@ -1337,7 +1337,8 @@ export const SplitPanelLayout2Component: React.FC<SplitPanelLayout2ComponentProp
           if (result.success && Array.isArray(result.data) && result.data.length > 0) {
             for (const item of result.data) {
               if (item.valueCode && item.valueLabel) {
-                labelMap[item.valueCode] = item.valueLabel;
+                // 계층 경로 표시: path가 있고 '/'를 포함하면 전체 경로를 ' > ' 구분자로 표시
+                labelMap[item.valueCode] = item.path && item.path.includes('/') ? item.path.replace(/\//g, ' > ') : item.valueLabel;
               }
             }
           }