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>

release.sh

@@ -170,6 +170,22 @@ else
     exit 1
 fi
 
+# ── Auto-Update: APK auf RVS-Server kopieren ─
+RVS_UPDATE_HOST="${RVS_UPDATE_HOST:-}"
+if [ -n "$RVS_UPDATE_HOST" ]; then
+    echo -e "${GREEN}[6/6] APK auf RVS-Server kopieren (Auto-Update)...${NC}"
+    scp "$APK_PATH" "${RVS_UPDATE_HOST}:~/ARIA-AGENT/rvs/updates/${APK_NAME}" 2>/dev/null
+    if [ $? -eq 0 ]; then
+        echo -e "  ${GREEN}✓${NC} APK auf RVS-Server kopiert — Apps werden benachrichtigt"
+    else
+        echo -e "  ${YELLOW}APK konnte nicht auf RVS kopiert werden (RVS_UPDATE_HOST=$RVS_UPDATE_HOST)${NC}"
+        echo -e "  ${YELLOW}Manuell: scp $APK_PATH $RVS_UPDATE_HOST:~/ARIA-AGENT/rvs/updates/${APK_NAME}${NC}"
+    fi
+else
+    echo -e "${YELLOW}Auto-Update uebersprungen (RVS_UPDATE_HOST nicht gesetzt)${NC}"
+    echo -e "${YELLOW}Setze RVS_UPDATE_HOST in .env fuer automatische Verteilung${NC}"
+fi
+
 # ── Fertig ────────────────────────────────────
 echo ""
 echo -e "${GREEN}╔═══════════════════════════════════════════════════╗${NC}"
@@ -177,4 +193,5 @@ echo -e "${GREEN}║   Release $TAG ist live!$(printf '%*s' $((27 - ${#TAG})) ''
 echo -e "${GREEN}╠═══════════════════════════════════════════════════╣${NC}"
 echo -e "${GREEN}║${NC}   $GITEA_URL/$GITEA_REPO/releases/tag/$TAG"
 echo -e "${GREEN}║${NC}   APK: $APK_NAME ($APK_SIZE)"
+echo -e "${GREEN}║${NC}   Auto-Update: ${RVS_UPDATE_HOST:-nicht konfiguriert}"
 echo -e "${GREEN}╚═══════════════════════════════════════════════════╝${NC}"