Add /joining and /joined endpoints to track user join intent before
WebRTC handshake completes. This prevents meetings from being
deactivated while users are still connecting.
- Add pending_joins Redis module with 30s TTL
- Add /joining endpoint (called before WebRTC handshake)
- Add /joined endpoint (called after connection established)
- Check for pending joins before deactivating meetings in worker
- Frontend integration with connectionId per browser tab
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