Update README.md:
- Add landing page to features
- Update test coverage section (43% backend, 116 tests passing)
- Add WebRTC tests information (7 tests passing)
- Update project structure (HomePage, hooks, utils, tests)
- Add STUN servers to WebRTC features
- Remove STUN/TURN and server upload fallback from Next Up
- Update roadmap to Phase 3 in progress
- Update test flow with landing page
- Update progress to ~80%
Update SESSION_CONTEXT.md:
- Current phase: Phase 3 (MVP Finalization) in progress
- Add landing page and WebRTC tests to What Works Now
- Update What's Missing (remove STUN, add coverage improvement)
- Add HomePage to routes and key files
- Add useWebRTC, webrtcDetection, test files to key files
- Update socket.js description with WebRTC signaling
- Update final status with all completed phases
- Update progress and date
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