Add automatic skip detection for playlist playback

Background poller monitors HA media_player state during playlist sessions.
When a track transition occurs and the previous track was played < 40% of
its duration, automatically records "skip" feedback. Also includes the
previously uncommitted delete_feedback endpoint.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/haunt_fm/api/status.py

@@ -16,6 +16,8 @@ from haunt_fm.config import settings
 from haunt_fm.services.embedding import is_model_loaded
 from haunt_fm.services.embedding_worker import is_running as is_worker_running
 from haunt_fm.services.embedding_worker import last_processed as worker_last_processed
+from haunt_fm.services.skip_detector import get_sessions as get_skip_sessions
+from haunt_fm.services.skip_detector import is_running as is_skip_detector_running
 
 router = APIRouter(prefix="/api")
 
@@ -103,6 +105,25 @@ async def status(session: AsyncSession = Depends(get_session)):
                 "total_generated": total_playlists,
                 "last_generated": last_playlist.isoformat() if last_playlist else None,
             },
+            "skip_detector": {
+                "running": is_skip_detector_running(),
+                "active_sessions": len(get_skip_sessions()),
+                "sessions": [
+                    {
+                        "speaker_entity": entity,
+                        "playlist_id": s.playlist_id,
+                        "current_position": s.current_position,
+                        "total_tracks": len(s.tracks),
+                        "current_track": (
+                            f"{s.tracks[s.current_position]['artist']} - {s.tracks[s.current_position]['title']}"
+                            if s.current_position < len(s.tracks)
+                            else None
+                        ),
+                        "last_activity": s.last_activity_at.isoformat(),
+                    }
+                    for entity, s in get_skip_sessions().items()
+                ],
+            },
         },
         "dependencies": {
             "lastfm_api": "configured" if settings.lastfm_api_key else "not_configured",