- Add robots.txt with admin/API blocking - Add dynamic sitemap.xml with static pages and genre pages - Implement full meta tags (Open Graph, Twitter Cards, Canonical, Alternates) - Add SEO helper functions for domain detection and URL generation - Add generateMetadata to all pages (homepage, about, genre, special) - Support automatic domain detection for hoerdle.de and hördle.de - Add SEO configuration to lib/config.ts