Claude 5f75a19868 feat(02-01): implement MPVEngine with position polling and lifespan integration ...

- Create lightsync/audio/__init__.py package marker
- Create lightsync/audio/engine.py with MPVEngine class
  - Headless mpv wrapper (vo=null, ao from MPV_AO env var default null)
  - 10Hz polling loop in daemon thread (time.sleep(0.1), not observe_property)
  - Thread-safe get_state() returning position, paused, duration, loaded, file
  - load/play/pause/seek/stop methods (AUD-01, AUD-03)
  - apply_timer_fix() with sys.platform == win32 guard (INF-03)
- Update main.py lifespan to create/start/stop MPVEngine
  - MPV_AO env var controls audio output (default null for server mode)
  - engine exposed via app.state.engine for API routes

2026-04-06 13:03:43 +00:00

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