SEO foundation and crawlability fixes
Shipped route-level metadata, prerendered marketing pages, robots.txt, sitemap generation, and hosting-side 404 behavior for search bots.
- Added canonical tags, Open Graph/Twitter tags, and JSON-LD by route.
- Prerendered public marketing routes for stronger indexing and source-visible metadata.
- Added robots.txt + generated sitemap.xml and a custom server path for proper static file serving and 404s.