feat(api): add timestamp update for PUT requests

- Add server-side timestamp update for data modification
- Ensure 'updatedAt' field is always synchronized with the last modification time
- Improve data consistency and tracking

Author: fulleni

routes/api/v1/data/[id]/index.dart

@@ -185,6 +185,9 @@ Future<Response> _handlePut(
     throw const BadRequestException('Missing or invalid request body.');
   }
 
+  // Standardize timestamp before model creation
+  requestBody['updatedAt'] = DateTime.now().toUtc().toIso8601String();
+
   // Deserialize using ModelConfig's fromJson, catching TypeErrors locally
   dynamic itemToUpdate;
   try {