安全：增加测试批次上下文硬校验

shierfeng-fastapi-backend/middlewares/context_middleware.py

@@ -14,10 +14,10 @@ class ContextCleanupMiddleware(BaseHTTPMiddleware):
         """
         在每个请求处理完成后清理上下文信息
         """
-        response = await call_next(request)
-        # 请求处理完成后清理所有上下文变量
-        RequestContext.clear_all()
-        return response
+        try:
+            return await call_next(request)
+        finally:
+            RequestContext.clear_all()
 
 
 def add_context_cleanup_middleware(app: FastAPI) -> None: