feat: update user preferences and system settings management

qwen3-tts-backend/api/users.py

@@ -15,9 +15,12 @@ from db.crud import (
     list_users,
     create_user_by_admin,
     update_user,
-    delete_user
+    delete_user,
+    get_system_setting,
+    update_system_setting,
+    is_local_model_enabled
 )
-from schemas.user import User, UserCreateByAdmin, UserUpdate, UserListResponse
+from schemas.user import User, UserCreateByAdmin, UserUpdate, UserListResponse, SystemSettingsUpdate, SystemSettingsResponse
 
 router = APIRouter(prefix="/users", tags=["users"])
 limiter = Limiter(key_func=get_remote_address)
@@ -167,3 +170,42 @@ async def delete_user_by_id(
             status_code=status.HTTP_404_NOT_FOUND,
             detail="User not found"
         )
+
+@router.get("/system/settings", response_model=SystemSettingsResponse)
+async def get_system_settings(
+    current_user: Annotated[User, Depends(require_superuser)],
+    db: Session = Depends(get_db)
+):
+    local_enabled = is_local_model_enabled(db)
+    return {"local_model_enabled": local_enabled}
+
+@router.put("/system/settings")
+async def update_system_settings(
+    settings: SystemSettingsUpdate,
+    current_user: Annotated[User, Depends(require_superuser)],
+    db: Session = Depends(get_db)
+):
+    from db.models import User
+    from datetime import datetime
+
+    update_system_setting(db, "local_model_enabled", {"enabled": settings.local_model_enabled})
+
+    if not settings.local_model_enabled:
+        users = db.query(User).filter(User.is_superuser == False).all()
+        migrated_count = 0
+
+        for user in users:
+            prefs = user.user_preferences or {}
+            if prefs.get("default_backend") == "local":
+                prefs["default_backend"] = "aliyun"
+                user.user_preferences = prefs
+                user.updated_at = datetime.utcnow()
+                migrated_count += 1
+
+        db.commit()
+        return {
+            "message": "System settings updated",
+            "users_migrated": migrated_count
+        }
+
+    return {"message": "System settings updated", "users_migrated": 0}