SEO & Search Optimization

F18.13 was originally scoped as a standalone subsystem for advanced SEO and search optimization, but during implementation the work consolidated into adjacent subsystems to avoid duplication. The eight features that would have lived here — enhanced meta titles with configurable templates and length limits, enhanced Open Graph with og:locale and article-specific properties, dedicated Twitter Cards with site defaults and per-page handles, Schema.org SportsClub structured data, auto-generated sitemap.xml with hreflang alternates, enhanced robots.txt per CMS instance, language-aware canonical URLs, and hreflang link tags with x-default — were all delivered under PL-F1813a and PL-F1813b but are surfaced in the inventory as part of the F18.12 'Theme & Customization' bundle to keep the editor's mental model coherent (one subsystem covers everything they tweak in site settings). The features themselves are fully implemented and live: SEO preview endpoints simulate the SERP appearance with character-length warnings, the SEO audit endpoint scores a page 0–100 against an SEO checklist, the sitemap endpoint at `/public/cms/sites/{id}/sitemap.xml` ships dynamic XML with lastmod/changefreq/priority and hreflang alternates per language, the canonical resolver picks the right path for default vs. non-default languages, and the hreflang tag emitter handles partial translation awareness so untranslated pages don't ship broken alternates.

This subsystem entry exists for historical traceability of feature IDs F18.13.* and to make the original product roadmap auditable; readers should consult F18.12 for the implementation details.