docs: add SEO meta, canonical URLs, robots.txt and llms.txt

[0ptaq0]

The docs site at https://cachemanager.beyondthecloud.dev had no sitemap, no robots.txt, no canonical URLs, no Open Graph tags and no structured data. It also had no llms.txt for AI crawlers.

Changes:

• Add vitepress-plugin-llms, generating llms.txt and llms-full.txt at build time.
• Add sitemap generation with the site hostname.
• Add website/public/robots.txt pointing at the sitemap.
• Add per-page canonical, og:url, og:title and og:description via transformPageData. Canonical URLs follow the existing cleanUrls setting (no .html).
• Add og:type, og:site_name, og:image, twitter:card, author and a JSON-LD SoftwareApplication block in head.
• Extend the site description to say what the library covers (org, session and transaction cache) and that it is MIT licensed and part of Apex Fluently.

Verified with npm run docs:build. The dist output contains llms.txt, llms-full.txt, robots.txt and sitemap.xml, and the rendered pages include canonical and og tags.

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Project	Deployment	Actions	Updated (UTC)
cache-manager	Ready	Preview	Aug 18, 2026 9:14pm

[github-actions]

🧪 Apex Test Results

✅ All Tests Passed

==========================================
     APEX TEST EXECUTION SUMMARY
==========================================

📊 Total Tests: 21
✅ Passed: 21
❌ Failed: 0
⏭️  Skipped: 0


🎉 All tests passed successfully!

📦 Download Full Test Results & Logs

---

📊 Stats: 21 total | ✅ 21 passed | ❌ 0 failed
🤖 Automated comment by Salesforce CI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.24%. Comparing base (2483daa) to head (48cafb5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   80.24%   80.24%           
=======================================
  Files           1        1           
  Lines          81       81           
=======================================
  Hits           65       65           
  Misses         16       16           

Flag	Coverage Δ
Apex	80.24% <ø> (ø)

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