Fix broken internal markdown links in docs renderer

[JGPliskin]

Summary

Fix broken internal markdown links in the docs site.

Markdown links such as ./glossary.md were being rendered as raw relative hrefs, which caused broken URLs like:

/zh/docs/s00-architecture-overview/glossary.md

instead of routing to the app's actual doc pages.

Cause

The markdown renderer converted markdown content to HTML, but did not rewrite internal .md links to the site's route structure.

Fix

Update the docs renderer to map internal markdown links using the generated docs index:

• bridge docs -> /{locale}/docs/{slug}
• chapter docs -> /{locale}/{version}

This keeps the markdown source unchanged while fixing navigation at render time.

Validation

• Reproduced the broken link locally
• Ran npm run build successfully
• Confirmed generated output no longer contains raw internal .md hrefs for site docs

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