docs: sync documentation with recent product changes

[cursor]

Summary

Audits the last 24 hours of changes in content, gt, and gt-cloud, then synchronizes the public documentation.

Broken

• Replace stale post-refactor docs URLs in blog and devlog content.
• Point coding-agent guidance at the published /sitemap.xml route instead of the nonexistent /sitemap.md file.

Wrong

• Document Next.js automatic JSX injection, including the compiler dependency and webpack-only requirement.
• Correct the CommonJS SPA loader and clarify <T> provider requirements.
• Add Google Drive integration documentation for access modes, supported files, translated copies, Apply changes, and Force retranslation.
• Correct the Dashboard retranslation FAQ.

Polish

• Remove hand-authored related-link roundups and fix recent frontmatter/style issues.
• Document the devHotReload parsing flag.

Verification

• node --experimental-strip-types scripts/validate-links.ts
• pnpm build:content
• Fresh Next.js 16.2.10 project using published gt-next@11.0.10 and @generaltranslation/compiler@1.3.32:
  • webpack build succeeds with automatic JSX injection
  • Turbopack build succeeds while warning that injection is skipped
• Published config-spread types compile with gt-react@11.0.10, generaltranslation@9.0.3, and gt-node@1.0.7
• Corrected CommonJS translation loader executes successfully