feng f490ce3296 enhance: SEO/GEO deep optimization — schema.org, hreflang, canonical, UX ...

- All 9 pages: Schema.org TechArticle JSON-LD structured data
- All 9 pages: hreflang tags (zh/en/x-default) for GEO targeting
- 7 pages: canonical URLs added (index + censorship already had them)
- 4 pages: meta descriptions added
- All 9 pages: nav bar current-page highlighting via JS
- All 9 pages: back-to-top button (appears on scroll >400px)

Co-Authored-By: Claude <noreply@anthropic.com>

2026-03-25 05:47:36 +08:00

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