修复parts的错误

app/service/chat/gemini_chat_service.py

@@ -135,7 +135,7 @@ def _filter_empty_parts(contents: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
 
 def _build_payload(model: str, request: GeminiRequest) -> Dict[str, Any]:
     """构建请求payload"""
-    request_dict = request.model_dump()
+    request_dict = request.model_dump(by_alias=True, exclude_none=False)
     if request.generationConfig:
         if request.generationConfig.maxOutputTokens is None:
             # 如果未指定最大输出长度，则不传递该字段，解决截断的问题

app/service/chat/vertex_express_chat_service.py

@@ -115,7 +115,7 @@ def _get_safety_settings(model: str) -> List[Dict[str, str]]:
 
 def _build_payload(model: str, request: GeminiRequest) -> Dict[str, Any]:
     """构建请求payload"""
-    request_dict = request.model_dump()
+    request_dict = request.model_dump(by_alias=True, exclude_none=False)
     if request.generationConfig:
         if request.generationConfig.maxOutputTokens is None:
             # 如果未指定最大输出长度，则不传递该字段，解决截断的问题

app/service/tts/native/tts_chat_service.py

@@ -69,7 +69,7 @@ class TTSGeminiChatService(GeminiChatService):
             # 构建TTS专用的payload - 不包含tools和safetySettings
             from app.service.chat.gemini_chat_service import _filter_empty_parts
 
-            request_dict = request.model_dump()
+            request_dict = request.model_dump(by_alias=True, exclude_none=False)
 
             # 构建TTS专用的简化payload
             payload = {
@@ -130,7 +130,7 @@ class TTSGeminiChatService(GeminiChatService):
                 error_type="tts-api-error",
                 error_log=error_msg,
                 error_code=status_code,
-                request_msg=request.model_dump()
+                request_msg=request.model_dump(by_alias=True, exclude_none=False)
             )
 
             logger.error(f"TTS API call failed: {error_msg}")