add get users

src/services/users.py

@@ -21,4 +21,8 @@ class UserService(BaseService):
         user = await self.get_user_by_username_or_raise(username)
         if not user.is_superuser:
             raise HTTPException(status_code=403, detail="Admin access required")
-        return user 
+        return user
+
+    async def get_all_users(self) -> list[User]:
+        users = await self.session.user.get_all_users()
+        return [User.model_validate(user) for user in users]