feat: add authentik admin user sync endpoint

app/repositories/users_repo.py

@@ -18,17 +18,21 @@ class UsersRepository:
         email: str | None,
         display_name: str | None,
         is_active: bool,
+        authentik_user_id: int | None = None,
     ) -> User:
         user = self.get_by_sub(authentik_sub)
         if user is None:
             user = User(
                 authentik_sub=authentik_sub,
+                authentik_user_id=authentik_user_id,
                 email=email,
                 display_name=display_name,
                 is_active=is_active,
             )
             self.db.add(user)
         else:
+            if authentik_user_id is not None:
+                user.authentik_user_id = authentik_user_id
             user.email = email
             user.display_name = display_name
             user.is_active = is_active