Josh Patra 3e5c57766b feat: pre-build playlist cache and make matching interval configurable ...

- Pre-build playlist items cache during track matching for instant serving
- Add PreBuildPlaylistItemsCacheAsync() to SpotifyTrackMatchingService
- Combines local Jellyfin tracks + external matched tracks in correct Spotify order
- Saves to both Redis and file cache for persistence across restarts
- Change matching interval from hardcoded 30 minutes to configurable (default: 24 hours)
- Add SPOTIFY_IMPORT_MATCHING_INTERVAL_HOURS environment variable
- Set to 0 to only run once on startup (manual trigger still works)
- Add endpoint usage files to .gitignore
- Update documentation in README and .env.example

Rationale: Spotify playlists like Discover Weekly update once per week,
so running every 24 hours is more than sufficient. Pre-building the cache
eliminates slow 'on the fly' playlist building.

All 225 tests pass.

2026-02-04 17:03:50 -05:00

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