refactor: remove unused response normalizer module

- Delete unused ResponseNormalizer class and its initialization logic
- Remove response_normalizer and enable_response_normalization parameters from handlers
- Simplify chat adapter base initialization by removing normalizer setup
- Clean up unused imports in handler modules

src/api/handlers/base/chat_adapter_base.py

@@ -64,18 +64,6 @@ class ChatAdapterBase(ApiAdapter):
 
     def __init__(self, allowed_api_formats: Optional[list[str]] = None):
         self.allowed_api_formats = allowed_api_formats or [self.FORMAT_ID]
-        self.response_normalizer = None
-        # 可选启用响应规范化
-        self._init_response_normalizer()
-
-    def _init_response_normalizer(self):
-        """初始化响应规范化器 - 子类可覆盖"""
-        try:
-            from src.services.provider.response_normalizer import ResponseNormalizer
-
-            self.response_normalizer = ResponseNormalizer()
-        except ImportError:
-            pass
 
     async def handle(self, context: ApiRequestContext):
         """处理 Chat API 请求"""
@@ -228,8 +216,6 @@ class ChatAdapterBase(ApiAdapter):
             user_agent=user_agent,
             start_time=start_time,
             allowed_api_formats=self.allowed_api_formats,
-            response_normalizer=self.response_normalizer,
-            enable_response_normalization=self.response_normalizer is not None,
             adapter_detector=self.detect_capability_requirements,
         )
 

src/api/handlers/base/chat_handler_base.py

@@ -88,8 +88,6 @@ class ChatHandlerBase(BaseMessageHandler, ABC):
         user_agent: str,
         start_time: float,
         allowed_api_formats: Optional[list] = None,
-        response_normalizer: Optional[Any] = None,
-        enable_response_normalization: bool = False,
         adapter_detector: Optional[Callable[[Dict[str, str], Optional[Dict[str, Any]]], Dict[str, bool]]] = None,
     ):
         allowed = allowed_api_formats or [self.FORMAT_ID]
@@ -106,8 +104,6 @@ class ChatHandlerBase(BaseMessageHandler, ABC):
         )
         self._parser: Optional[ResponseParser] = None
         self._request_builder = PassthroughRequestBuilder()
-        self.response_normalizer = response_normalizer
-        self.enable_response_normalization = enable_response_normalization
 
     @property
     def parser(self) -> ResponseParser: