Fix queue processing error: remove empty params.append() calls

- Fixed 'list.append() takes exactly one argument (0 given)' error in update_queue_status
- Removed empty params.append() calls for timestamp fields that use CURRENT_TIMESTAMP directly
- Queue processing should now work correctly without errors

vidai/database.py

@@ -1140,10 +1140,8 @@ def update_queue_status(queue_id: int, status: str, result: dict = None, error:
 
     if status == 'processing':
         update_fields.append('started_at = CURRENT_TIMESTAMP')
-        params.append()
     elif status in ['completed', 'failed']:
         update_fields.append('completed_at = CURRENT_TIMESTAMP')
-        params.append()
 
     if result:
         update_fields.append('result = ?')