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robots.txt was absent at the origin, so Cloudflare served its Free-plan Content Signals Policy placeholder — a file with no User-agent, no Sitemap and no directives. Adds src/pages/robots.txt.ts (origin 200 → CF merges instead of substituting) pointing at sitemap-index.xml, disallowing /pagefind/, and expressing search=yes / ai-input=yes / ai-train=no in line with the two-lane SEO+GEO strategy in docs/seo-reference.md. Citation crawlers (Google-Extended, OAI-SearchBot, PerplexityBot, ClaudeBot) stay allowed; only training-only harvesters blocked. hreflang was never emitted despite full EN/ZH i18n: both language versions sat in the sitemap with no cross-reference. BaseLayout gains altLocaleUrl and emits en/zh/x-default per page; every post pair, category pair, and landing page now cross-links. Also adds BlogPosting JSON-LD (@id-linked to the site-wide Person node) so Google has a rich-result-eligible node per article, and creates the missing /zh/about/ page — the EN about page pointed its language switch at a 404, and /about/ was the only unpaired page after hreflang landed.