style(backend): apply ruff format

apps/backend/schemas/response.py

@@ -1,15 +1,17 @@
 """
 统一的 API 响应 Schema
 """
+
 from typing import Generic, TypeVar, Optional
 from pydantic import BaseModel
 
 
-T = TypeVar('T')
+T = TypeVar("T")
 
 
 class ApiResponse(BaseModel, Generic[T]):
     """统一成功响应"""
+
     success: bool = True
     data: Optional[T] = None
     message: Optional[str] = None
@@ -17,6 +19,7 @@ class ApiResponse(BaseModel, Generic[T]):
 
 class ErrorDetail(BaseModel):
     """错误详情"""
+
     code: str
     message: str
     field: Optional[str] = None  # 字段验证错误时使用
@@ -24,5 +27,6 @@ class ErrorDetail(BaseModel):
 
 class ErrorResponse(BaseModel):
     """统一错误响应"""
+
     success: bool = False
     error: ErrorDetail