建议引入 Cloudflare Turnstile 或 Google reCAPTCHA

### 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

应用场景：
登录@manage登录过程中出现多次登录失败时，弹出人机验证；
多次访问加密文件夹密码错误时，弹出人机验证；
文件下载时，弹出人机验证以防止异常批量下载行为。

另外建议在设置项中提供开关，允许管理员根据实际需要选择启用/禁用人机验证

希望我的建议能被采纳，谢谢

### Suggested solution / 实现思路

_No response_

### Additional context / 附件

_No response_