feat: Add quota check decorator and implement tenant-level API rate limiting

- Add quota check decorator module quota_stub.py, providing community edition stub implementation
- Add quota check decorators to multiple controllers
- Implement tenant-level API call rate limiting
- Remove redundant plan fields from tenant_model.py
- Optimize user permission check logic with added error handling

api/app/controllers/knowledge_controller.py

@@ -27,6 +27,7 @@ from app.schemas import knowledge_schema
 from app.schemas.response_schema import ApiResponse
 from app.services import knowledge_service, document_service
 from app.services.model_service import ModelConfigService
+from app.core.quota_stub import check_knowledge_capacity_quota
 
 # Obtain a dedicated API logger
 api_logger = get_api_logger()
@@ -179,6 +180,7 @@ async def get_knowledges(
 
 
 @router.post("/knowledge", response_model=ApiResponse)
+@check_knowledge_capacity_quota
 async def create_knowledge(
         create_data: knowledge_schema.KnowledgeCreate,
         db: Session = Depends(get_db),