fix(mobile): use @config-plugins/react-native-webrtc, link EAS project

- replace bogus @livekit/* plugin entries with @config-plugins/react-native-webrtc@^10 (real Expo config plugin; LiveKit packages do not ship app.plugin.js)
- eas init linked project @bygalax/netralax (id 255e2fde-...)
- app.json picked up Expo defaults (Android permissions, owner)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/mobile/package.json

@@ -20,6 +20,7 @@
   "dependencies": {
     "@chat-app/db-types": "workspace:*",
     "@chat-app/shared": "workspace:*",
+    "@config-plugins/react-native-webrtc": "^10.0.0",
     "@livekit/react-native": "^2.10.3",
     "@livekit/react-native-webrtc": "^144.0.0",
     "@react-native-async-storage/async-storage": "^3.0.2",