feat: add sub category

app/dashboard/music/playlists/page.tsx

@@ -31,6 +31,8 @@ interface Playlist {
   detail_image_id?: number | null;
   detail_image?: unknown;
   is_premium?: boolean;
+  categories?: { id: number; name?: string }[];
+  subcategories?: { id: number; name?: string }[];
 }
 
 interface MusicCategory {
@@ -164,6 +166,14 @@ export default function MusicPlaylistsPage() {
       ),
     },
     { key: "name", header: "نام" },
+    {
+      key: "subcategories",
+      header: "زیر‌دسته",
+      render: (r) =>
+        r.subcategories?.length
+          ? r.subcategories.map((s) => s.name).filter(Boolean).join("، ")
+          : "—",
+    },
     {
       key: "description",
       header: "توضیحات",