* docs: add missing adapter docs, fix sidebar 404s, add doc-check CI
- Add doc pages for 11 undocumented adapters: arxiv, barchart,
chaoxing, grok, hf, jike, jimeng, linux-do, sinafinance,
stackoverflow, weread, wikipedia
- Update adapters/index.md with all new adapter entries
- Update VitePress sidebar config with 12 new entries
- Remove broken zh/ sidebar refs (troubleshooting, testing)
- Add doc-check CI workflow (adapter coverage + build + link check)
- Add scripts/check-doc-coverage.sh for adapter doc enforcement
- Enhance PR template with adapter doc checklist
* fix(ci): use --root-dir instead of --base for lychee link checker
lychee v0.23 requires --base to be a URL or absolute path.
Use --root-dir for resolving root-relative links in local files.
* fix(ci): remove lychee link-check job, rely on VitePress build
VitePress links use extension-less paths (e.g. /adapters/browser/twitter)
which lychee cannot resolve. The docs-build job already catches all
broken internal links via VitePress dead link detection during build.
jakevin