fishandbread

### Issue Checklist - [X] I am using NexT version 8.0 or later. - [X] I have already read the [Troubleshooting page of Hexo](https://hexo.io/docs/troubleshooting) and [Troubleshooting page of NexT](https://theme-next.js.org/docs/troubleshooting.html). -...

如题，随着文章的增多，有分类搜索的需求，另外能否实现按第一级标签生成多个search.xml??选择哪个标签，就自动搜索哪个search.xml