fix: address code review findings

internal/musicbrainz/model.go

@@ -3,14 +3,19 @@ package musicbrainz
 // ReleaseGroup represents a MusicBrainz Release Group entity.
 // This is the primary data model for the provider - we work with
 // Release Groups to minimize duplicates from different releases.
+//
+// Type holds the primary type (Album, Single, EP, Other, Broadcast, ...).
+// SecondaryTypes holds secondary type classifications (Live, Compilation,
+// Remix, ...). Together they drive the scanner's type filtering; release
+// groups have no status, so there is no Status field.
 type ReleaseGroup struct {
-	ID          string
-	Title       string
-	Type        string
-	Status      string
-	ArtistID    string
-	ArtistName  string
-	ReleaseDate string
+	ID             string
+	Title          string
+	Type           string
+	SecondaryTypes []string
+	ArtistID       string
+	ArtistName     string
+	ReleaseDate    string
 }
 
 // ParsedReleaseGroups holds the result of parsing a MusicBrainz