Shuffle music

I use Copyparty as my big music thing; it's really nice, cute, and quaint.

HOWEVER

I am sick of listening to them in the same order. It gets somewhat repetitive, and this would be amazing.

I would probably make a PR off of this, I don't know. I love this as much as the next guy enough to contribute.

在代码库中查找音乐播放器或媒体索引器组件，该组件可能位于前端或媒体处理模块中。了解当前的播放列表顺序是如何确定的。实现一种 shuffle 算法，在不破坏现有功能的情况下随机化播放顺序。运行服务器并验证音乐是否按随机序列播放，以测试这项更改。

由索引模型根据 Issue 内容生成。