feat: 重构MCP功能和AI服务提供者架构

backend/app/schemas/writing_style.py

@@ -1,5 +1,5 @@
 """写作风格 Schema"""
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, ConfigDict
 from typing import Optional
 from datetime import datetime
 
@@ -48,8 +48,7 @@ class WritingStyleResponse(BaseModel):
     created_at: datetime
     updated_at: datetime
     
-    class Config:
-        from_attributes = True
+    model_config = ConfigDict(from_attributes=True)
 
 
 class WritingStyleListResponse(BaseModel):