LiveKit StreamYard-style Starter

Files:
- config.php
- livekit_token.php
- guest.php
- studio.php
- assets/studio.css
- assets/guest.js
- assets/studio.js

Setup:
1. Upload all files to one folder.
2. Edit config.php:
   - livekit_url = wss://your-livekit-domain
   - livekit_api_key
   - livekit_api_secret
   - operator_pin
3. Open studio.php?room=itahuka-live
4. Enter operator PIN and connect.
5. Send guests: guest.php?room=itahuka-live

This starter does browser switching/staging only. RTMP/recording requires LiveKit Egress or FFmpeg bridge as the next step.
