fix: music test apis

app/Models/MusicPlaylist.php

@@ -3,7 +3,8 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
-
+use Illuminate\Database\Eloquent\Relations\BelongsTo;  // ← Add this
+use Illuminate\Database\Eloquent\Relations\HasMany;    // ← Add this
 class MusicPlaylist extends Model
 {
     protected $table = 'music_playlists';