[Feature] 新增api - 备份/还原

Please make sure of the following things

• I have read the documentation.
• I'm sure there are no duplicate issues or discussions.
• I'm sure this feature is not implemented.
• I'm sure it's a reasonable and popular requirement.

Description of the feature / 需求描述

截至4.0.3版本为止，目前可以在web端 /@manage/backup-restore 页面进行手动备份恢复。
简单看了下逻辑是拼接了以下四个接口的data。

• /api/admin/setting/list
• /api/admin/user/list
• /api/admin/storage/list
• /api/admin/meta/list

当需要流程化自动备份时，虽然可以手动完成这部分工作，但是无法应对未来接口的变化。
例如

• 备份流程中新增了其他内容
• api接口的变更

Suggested solution / 实现思路

希望新增一个 备份/还原 接口来隐藏 备份/还原 操作的细节。
/api/admin/backup
/api/admin/restore

web ui中的备份还原操作也转而调用该接口，隐藏当前备份还原的细节。

Additional context / 附件

No response

Start at the web UI page /@manage/backup-restore and trace its use of /api/admin/setting/list, /api/admin/user/list, /api/admin/storage/list, and /api/admin/meta/list. Define the /api/admin/backup and /api/admin/restore entry points, then update the UI to use them while preserving the current backup and restore contents and behavior.