[changes] 1.Use structured logs;

2.Align the type and default value of "end_user_id" with the semantic meaning of "required".

api/app/controllers/memory_agent_controller.py

@@ -664,7 +664,7 @@ async def get_knowledge_type_stats_api(
 
 @router.get("/analytics/interest_distribution/by_user", response_model=ApiResponse)
 async def get_interest_distribution_by_user_api(
-    end_user_id: Optional[str] = Query(None, description="用户ID（必填）"),
+    end_user_id: str = Query(..., description="用户ID（必填）"),
     limit: int = Query(5, le=5, description="返回兴趣标签数量限制，最多5个"),
     language_type: str = Header(default=None, alias="X-Language-Type"),
     current_user: User = Depends(get_current_user),