feat(models): add track duration and lyrics

internal/models/models.go

@@ -33,11 +33,13 @@ type Track struct {
 	ID          string         `json:"id"`
 	Name        string         `json:"name"`
 	Artists     []Artist       `json:"artists"`
+	Duration    float32        `json:"duration"`
 	ReleaseDate sql.NullTime   `json:"release_date"`
 	AcquireDate time.Time      `json:"acquire_date"`
 	ISRC        sql.NullString `json:"isrc"`
 	Credits     []Credit       `json:"credits"`
 	Notes       sql.NullString `json:"notes"`
+	Lyrics      sql.NullString `json:"lyrics"`
 }
 
 type Alias struct {