feat: enhance product detail retrieval to support variant selection and fallback image handling

app/Domains/Catalog/Resources/ProductVariantResource.php

@@ -2,11 +2,12 @@
 
 namespace App\Domains\Catalog\Resources;
 
+use App\Domains\Catalog\Models\ProductVariant;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
 
 /**
- * @mixin \App\Domains\Catalog\Models\ProductVariant
+ * @mixin ProductVariant
  */
 class ProductVariantResource extends JsonResource
 {
@@ -35,13 +36,19 @@ class ProductVariantResource extends JsonResource
                         ->values();
                 }
 
-                // Fallback: use product-level attachments when the variant has none
-                $this->loadMissing('product.attachments');
+                if ($this->relationLoaded('fallbackAttachments')) {
+                    return $this->fallbackAttachments
+                        ->map(fn ($attachment) => $attachment->getTemporaryUrl(1440))
+                        ->values();
+                }
 
-                return $this->product?->attachments
-                    ?->map(fn ($attachment) => $attachment->getTemporaryUrl(1440))
-                    ?->values()
-                    ?? collect();
+                if ($this->relationLoaded('product') && $this->product?->relationLoaded('attachments')) {
+                    return $this->product->attachments
+                        ->map(fn ($attachment) => $attachment->getTemporaryUrl(1440))
+                        ->values();
+                }
+
+                return collect();
             }),
         ];
     }