希望添加令牌或cookie失效的邮件通知功能

### Please make sure of the following things

- [x] I have read the [documentation](https://alist.nn.ci).
- [x] I'm sure there are no duplicate issues or discussions.
- [x] I'm sure this feature is not implemented.
- [x] I'm sure it's a reasonable and popular requirement.

### Description of the feature / 需求描述

最近发现运行备份的Duplicati备份任务失败了，原因是115网盘的cookies过期了。阿里云盘一直有效，不知道115发什么神经，失效了几次了。由此想到，能否加个cookies过期的邮件通知功能，告知用户失效了，去更新一下。

### Suggested solution / 实现思路

_No response_

### Additional context / 附件

_No response_