v1.3.0 — Phase 3: SQLite datalog (DB + recorder + player + providers)
- datalog_session.dart: DatalogSession model with toMap/fromMap, duration helpers
- datalog_db.dart: SQLite schema (sessions + frames tables), batch insertFrames,
getSessions, getFrames, deleteSession, closeSession
- datalog_recorder.dart: listens to raw frame stream, buffers PendingFrames,
flushes to DB every 500ms via Timer, finalises session on stop()
- datalog_player.dart: loads StoredFrames from DB, replays at original timing
adjusted by speed multiplier (0.25x–8x), play/pause/stop/seek, onProgress cb
- datalog_provider.dart: datalogDbProvider, datalogRecorderProvider,
datalogPlayerProvider singletons; RecordingNotifier (idle/recording state);
sessionListProvider FutureProvider; PlaybackNotifier with full playback state
- pubspec.yaml: added path ^1.9.0 dependency
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