Refactor document handling and update Milvus collection settings

- Removed multiple failed document entries from `documents.json`.
- Added a new document entry with updated metadata and changed the index name to `regulations_dense_1024_v2`.
- Updated architecture documentation to reflect changes in the Milvus collection name.
- Adjusted requirements by removing the sqlalchemy dependency.
- Modified test cases to align with new document structure and naming conventions.
- Introduced a new test file for Milvus vector index runtime recovery and error handling.
- Updated assertions in various test files to ensure compatibility with the new schema.

backend/app/api/routes/__init__.py

@@ -7,6 +7,7 @@ from .knowledge import router as knowledge_router
 from .agent import router as agent_router
 from .status import router as status_router
 from .perception import router as perception_router
+from .rag import router as rag_router
 # Keep package boundaries explicit so backend imports stay predictable.
 
 
@@ -20,6 +21,7 @@ api_router.include_router(agent_router)
 api_router.include_router(compliance_router)
 api_router.include_router(status_router)
 api_router.include_router(perception_router)
+api_router.include_router(rag_router)
 
 __all__ = [
     "api_router",
@@ -29,4 +31,5 @@ __all__ = [
     "compliance_router",
     "status_router",
     "perception_router",
+    "rag_router",
 ]