fix(message): 移除消息创建时间的重复设置

- 移除了消息对象中重复的 createTime 设置代码
- 保持消息创建时间由系统自动生成的逻辑

src/main/java/com/aitori/service/impl/TUserMessageServiceImpl.java

@@ -54,7 +54,6 @@ public class TUserMessageServiceImpl extends ServiceImpl<TUserMessageMapper, TUs
         message.setReadStatus(0);
         message.setType(messageType);
         message.setOrderId(orderId);
-        message.setCreateTime(LocalDateTime.now());
         message.setThumbUrl(thumbUrl);
         message.setAlbumId(albumId);
         return message;