* SEO: add title and description to all integration pages
All 17 integration docs pages were missing title and description
frontmatter, causing Docusaurus to generate unhelpful titles like
"OpenClaw | Hindsight" and pull body text as meta descriptions.
- Add keyword-rich title and description frontmatter to all integration
pages in both docs/ (current) and versioned_docs/version-0.4/
- Add scripts/check-integration-seo.mjs to enforce title + description
on all future integration pages
- Wire the check into the build script so it runs locally and in CI
* Fix missing frontmatter on docs/sdks/integrations/openclaw.md
* Regenerate docs skill after integration page SEO updates
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