Add comprehensive SEO support for property listing pages to improve
organic search visibility and social sharing.
Changes:
- Convert listing detail page from client-only to server component wrapper
with generateMetadata() for per-listing title, description, OG tags,
canonical URLs, and hreflang alternates
- Add JSON-LD structured data (Schema.org RealEstateListing) with price,
location, property specs, and breadcrumb markup
- Add Website JSON-LD with SearchAction to root layout
- Upgrade sitemap.xml to dynamically include all active listings across
both locales (vi, en) with ISR revalidation
- Improve robots.txt with pagination/sort exclusions and GPTBot block
- Create server-side fetch utility (listings-server.ts) for SSR data
- Extract client UI into ListingDetailClient component
Co-Authored-By: Paperclip <noreply@paperclip.ing>
