Phase 4: Voice & Video Calls - Complete WebRTC Implementation
- Database schema: Extended calls/call_participants tables, added turn_credentials
- Backend: callService (390+ lines), 7 REST API endpoints, WebSocket signaling
- Frontend: WebRTC manager utility, Call React component with full UI
- Features: 1-on-1 calls, group calls, screen sharing, media controls
- Security: TURN credentials with HMAC-SHA1, 24-hour TTL
- Documentation: PHASE4-CALLS.md with complete setup guide
- Testing: Server running successfully with all routes loaded
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