feat: implement polymorphic relationships for group items to support bundles and product variants

app/Domains/Catalog/Resources/FeaturedVariantResource.php

@@ -2,6 +2,8 @@
 
 namespace App\Domains\Catalog\Resources;
 
+use App\Domains\Bundle\Models\Bundle;
+use App\Domains\Catalog\Models\ProductVariant;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
 
@@ -12,7 +14,12 @@ class FeaturedVariantResource extends JsonResource
         return [
             'id' => $this->id,
             'featured_group_id' => $this->featured_group_id,
-            'product_variant_id' => $this->product_variant_id,
+            'groupable_type' => match ($this->groupable_type) {
+                ProductVariant::class => 'variant',
+                Bundle::class => 'bundle',
+                default => 'unknown',
+            },
+            'groupable_id' => $this->groupable_id,
             'order' => $this->order,
         ];
     }