refactor(server): asset service - upload asset (#1438)

* refactor: asset upload

* refactor: background service

* chore: tests

* Regenerate api

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/openapi/test/asset_file_upload_response_dto_test.dart

@@ -21,6 +21,11 @@ void main() {
       // TODO
     });
 
+    // bool duplicate
+    test('to test the property `duplicate`', () async {
+      // TODO
+    });
+
 
   });