feat(core)!: routeService ignore "_" prefix files by default

[SoonIter]

Summary

Docusaurus has a Partial mdx convention, starting with '_', mainly used to exclude document fragments in convention-based routing.

import PartialExample from './_partial.mdx'

to replace

// rspress.config.ts
route: {
   exclude: ['**/shared/**']
}

Related Issue

https://docusaurus.io/docs/markdown-features/react#importing-markdown

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Timeless0911]

We need to document it.

[JounQin]

Would !**/_* restore the previous behavior?

[SoonIter]

Would !**/_* restore the previous behavior?

what previous behavior?

[JounQin]

what previous behavior?

_foo.mdx won't be ignored, it'll be used as _foo route.

[Copilot]

Pull Request Overview

This PR implements automatic exclusion of files with underscore prefix from route generation, following Docusaurus partial MDX conventions. This allows developers to create partial/shared MDX components without needing to manually configure exclusion patterns.

• Adds **/_* pattern to default route exclusions to automatically ignore underscore-prefixed files
• Adds test fixture for partial MDX file to validate the exclusion behavior

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/node/route/RouteService.ts	Adds default exclusion pattern for underscore-prefixed files
packages/core/src/node/route/fixtures/basic/guide/_d.mdx	Test fixture for partial MDX file to verify exclusion works