Rspeedy APIs are missing names in the generated llms.txt

[Huxpro]

Looking at the generated https://lynxjs.org/llms.txt, APIs from Rspeedy are missing names somehow:

// React
- [Variable: root](/api/react/Variable.root.md)

// Rspeedy
- [](/api/rspeedy/index.md)
- [](/api/rspeedy/rspeedy.config.environments.md)
// ... all links are missing titles

I'm guessing this is due to Rspeedy configuring its sidebar programmatically... we should try to either support that in Rspress, or migrating how we handle Rspeedy API docs.