fix(audio,flutter): parse Android UsbHeadset and Hdmi route strings

apps/chanora_flutter/lib/services/audio_lifecycle_service.dart: extend parseBridgeAudioRoute to handle 'UsbHeadset' (maps to wiredHeadset — USB audio is functionally a wired-class device, matching AndroidAudioLifecycleController.classifyCurrentRoute's own preference ordering at line 176) and 'Hdmi' (maps to unknown — HDMI is a display-out transport, not a voice-call audio path; no existing BridgeAudioRoute variant fits; safer to leave as unknown than to misclassify as Speaker). Previously these Android-emitted strings hit the default branch and silently became BridgeAudioRoute.unknown.

apps/chanora_flutter/test/services/audio_lifecycle_service_test.dart: split the existing single test into three — iOS-classified strings (preserved), Android UsbHeadset (new), Android Hdmi (new). flutter test: 3 passed, 0 failed.

apps/chanora_flutter/lib/services/audio_lifecycle_service.dart

@@ -14,11 +14,15 @@ rust.BridgeAudioRoute parseBridgeAudioRoute(String value) {
     case 'Speaker':
       return rust.BridgeAudioRoute.speaker;
     case 'WiredHeadset':
+    case 'UsbHeadset':
       return rust.BridgeAudioRoute.wiredHeadset;
     case 'BluetoothHfp':
       return rust.BridgeAudioRoute.bluetoothHfp;
     case 'BluetoothA2dp':
       return rust.BridgeAudioRoute.bluetoothA2Dp;
+    case 'Hdmi':
+    case 'Unknown':
+      return rust.BridgeAudioRoute.unknown;
     default:
       return rust.BridgeAudioRoute.unknown;
   }