- Create /api/og-image endpoint that generates SVG with 1.91:1 ratio (1200x630px)
- Prevents logo cropping on Facebook and Twitter
- Uses safe padding (150px) to ensure content is never cut off
- Update default OG image to use dynamic endpoint
- Add SEO testing documentation
- 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
