fixes and refactor

app/auth/schemas.py

@@ -3,6 +3,7 @@ Authentication schemas
 """
 from typing import Optional
 from pydantic import BaseModel, EmailStr
+from pydantic.config import ConfigDict
 
 
 class UserBase(BaseModel):
@@ -32,8 +33,7 @@ class UserResponse(UserBase):
     is_admin: bool
     theme_preference: Optional[str] = "light"
     
-    class Config:
-        from_attributes = True
+    model_config = ConfigDict(from_attributes=True)
 
 
 class ThemePreferenceUpdate(BaseModel):
@@ -45,7 +45,7 @@ class Token(BaseModel):
     """Token response schema"""
     access_token: str
     token_type: str
-    refresh_token: str | None = None
+    refresh_token: Optional[str] = None
 
 
 class TokenData(BaseModel):