docs: add missing adapter docs, fix sidebar 404s, add doc-check CI (#140)

* 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.

.github/pull_request_template.md

@@ -19,6 +19,13 @@ Related issue:
 - [ ] I updated tests or docs if needed
 - [ ] I included output or screenshots when useful
 
+### Documentation (if adding/modifying an adapter)
+
+- [ ] Added doc page under `docs/adapters/` (if new adapter)
+- [ ] Updated `docs/adapters/index.md` table (if new adapter)
+- [ ] Updated sidebar in `docs/.vitepress/config.mts` (if new adapter)
+
 ## Screenshots / Output
 
 <!-- If applicable, paste CLI output or screenshots here. -->
+

.github/workflows/doc-check.yml

@@ -0,0 +1,36 @@
+name: Doc Check
+
+on:
+  pull_request:
+    branches: [main, dev]
+
+concurrency:
+  group: doc-check-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  # ── Adapter doc coverage ──
+  doc-coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check adapter doc coverage
+        run: bash scripts/check-doc-coverage.sh --strict
+
+  # ── VitePress build validation ──
+  docs-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build docs (catches broken links & sidebar refs)
+        run: npm run docs:build