api: implement bare-bones userinfo endpoint

api/src/dooris_api/models.py

@@ -1,14 +1,9 @@
 from typing import Optional
-from datetime import datetime
 from pydantic import BaseModel
 from simple_openid_connect.data import IdToken
 
 
 class CurrentUser(BaseModel):
-    access_token: str
-    access_token_expiry: datetime
-    refresh_token: Optional[str]
-    refresh_token_expiry: Optional[datetime]
     id_token: IdToken