[P2] Landing page prerendering / SSR

[hazeliscoding]

Problem

The landing page is inside the Angular SPA. Without prerendering, it's invisible to search engines and produces blank Open Graph previews on social share.

Requirements

• Add @angular/ssr or use Angular prerendering for the landing page route (/)
• Include proper Open Graph meta tags (title, description, image) for social sharing
• Ensure the prerendered page hydrates correctly on the client

Acceptance Criteria

• / route returns server-rendered HTML (viewable with JavaScript disabled)
• Social sharing on Discord/Twitter/etc. shows a proper preview card
• Google can index the landing page content
• Hydration doesn't cause layout shifts or flicker

References

• Roadmap §12 — Frontend Engineering