feat(iframe): add iframe bridge for ragflow integration

- Implement Penpal-based iframe communication bridge between host and child apps
- Add route handling for ragflow integration with '/route-ragflow' prefix
- Update navigation hooks to support embedded mode via iframe bridge
- Configure build and dependencies for new iframe-bridge package
- Adjust nginx config for proper SPA routing in subpath deployments

ragflow_web/package.json

@@ -21,6 +21,8 @@
     ]
   },
   "dependencies": {
+    "@teres/iframe-bridge": "workspace:*",
+    "penpal": "^6.2.1",
     "@ant-design/icons": "^5.2.6",
     "@ant-design/pro-components": "^2.6.46",
     "@ant-design/pro-layout": "^7.17.16",