feat: XTTS v2 integration, auto-update system, TTS engine abstraction

- XTTS v2: Docker setup for Gaming-PC (GPU), bridge via RVS relay
- XTTS: Voice cloning UI in Diagnostic (multi-file upload)
- XTTS: Engine selectable (Piper local vs XTTS remote) with fallback
- Auto-Update: RVS serves APK over WebSocket (no HTTP needed)
- Auto-Update: App checks version on start, prompts install
- Auto-Update: release.sh copies APK to RVS via scp
- Bridge: TTS engine abstraction (piper/xtts), config persistent
- Bridge: xtts_response handler, tts_request on-demand
- Diagnostic: TTS engine dropdown, XTTS voice panel, voice cloning
- App: Play button on ARIA messages, chat search, update service
- Wake word: Disabled LiveAudioStream (crash fix), Phase 1 placeholder
- Watchdog: Container restart after 8min stuck
- Chat backup: on-the-fly to /shared/config/chat_backup.jsonl

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

android/src/services/rvs.ts

@@ -12,7 +12,7 @@ import AsyncStorage from '@react-native-async-storage/async-storage';
 
 export type ConnectionState = 'connecting' | 'connected' | 'disconnected';
 
-export type MessageType = 'chat' | 'audio' | 'file' | 'location' | 'mode' | 'log' | 'event';
+export type MessageType = 'chat' | 'audio' | 'file' | 'location' | 'mode' | 'log' | 'event' | 'update_available' | string;
 
 export interface RVSMessage {
   type: MessageType;