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Add a public marketing landing at "/" celebrating the Top-3 finish at the AI Engineer World's Fair 2026 hackathon (2nd overall of 95+ teams, LiveKit track + DigitalOcean Best Use), with a scroll-to-read hero, feature/tech sections, and the demo embed. Introduce react-router: "/" serves the public landing (no auth) and "/app" mounts the existing Clerk-gated app. The app route degrades gracefully to a "deploying" placeholder when no Clerk publishable key is configured, so the site renders without secrets. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>