feat(flutter/cache): drift schema + new deps + CI codegen step (#357 plan B)
Adds the offline-mode foundation:
- pubspec deps: drift, drift_flutter, sqlite3_flutter_libs,
connectivity_plus + drift_dev/build_runner (dev)
- lib/cache/db.dart with 8 tables: CachedArtists/Albums/Tracks/Likes/
Playlists/PlaylistTracks + AudioCacheIndex + SyncMetadata
- *.g.dart added to .gitignore (build_runner regenerates per build)
- CI workflow gains a 'Codegen (drift)' step between pub get and
analyze so the generated symbols exist when analyze runs
CacheSource enum drives tiered LRU eviction (manual/autoLiked/
autoPlaylist/autoPrefetch/incidental). Subsequent commits add the
sync controller, audio cache manager, prefetcher, settings UI.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
326b7008a9