feat: fuzzy search with parallel DB/MusicBrainz execution

- Add pg_trgm fuzzy search to PostgreSQL artist repository
- Add Lucene fuzzy query (~0.7) for MusicBrainz artist search
- Run DB and MusicBrainz searches in parallel goroutines
- Cache MusicBrainz results to DB for accumulation
- Deduplicate results by external ID
- Filter out special purpose artists (type=Other)
- Add SaveAll method for batch artist inserts
- Move database schema to containers repo

cmd/server/noop_repo.go

@@ -25,6 +25,10 @@ func (r *noopArtistRepo) Save(ctx context.Context, artist *domain.Artist) error
 	return nil
 }
 
+func (r *noopArtistRepo) SaveAll(ctx context.Context, artists []domain.Artist) error {
+	return nil
+}
+
 type noopAlbumRepo struct{}
 
 func (r *noopAlbumRepo) GetByID(ctx context.Context, id string) (*domain.Album, error) {