C-XIAOZHI Phase 3 v0.10.0 - Chat-First UI + Native Hard Stop

- No Home screen. App opens directly into Chat in true Standby.
- A: Start Chat / Wake-Retry.
- B while active: Stop Chat, remain on Chat screen.
- B while Standby: Exit app.
- UP/DOWN: Scroll history.
- SELECT: Settings.
- Clean server-ended conversation is detected inside the native controller.
- Controller immediately latches the session as ended, kills the exact core PID,
  and prevents auto-restart until the user explicitly presses A again.
- Keeps existing activation/data/audio profile; ZIP contains no data directory.
