能否加一个对于Alist本身的加密？

### 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

简单来说就是启动时需要输入一次密码来解密数据库，即使出现意外主机被偷走，或者是主机被入侵，Alist里的数据也不会泄露威胁到网盘的数据

### Suggested solution / 实现思路

_No response_

### Additional context / 附件

_No response_