refactor(mobile): asset provider (#16159)

* refactor(mobile): asset provider

* wip

* wip: delete local assets

* wip: delete remote assets

* wip: deletion logic

* refactor

* pr feedback

mobile/lib/services/user.service.dart

@@ -103,4 +103,8 @@ class UserService {
     if (users == null) return false;
     return _syncService.syncUsersFromServer(users);
   }
+
+  Future<void> clearTable() {
+    return _userRepository.clearTable();
+  }
 }