feat(sso): update User model and schemas for Keycloak

backend/app/schemas.py

@@ -1,15 +1,9 @@
 from datetime import datetime
 from typing import Optional
-from pydantic import BaseModel, EmailStr
+from pydantic import BaseModel
 
 
 # --- Auth ---
-class UserCreate(BaseModel):
-    username: str
-    email: EmailStr
-    password: str
-
-
 class UserOut(BaseModel):
     id: int
     username: str
@@ -19,11 +13,6 @@ class UserOut(BaseModel):
     model_config = {"from_attributes": True}
 
 
-class LoginRequest(BaseModel):
-    username: str
-    password: str
-
-
 # --- Config ---
 class ConfigCreate(BaseModel):
     name: str