feat: create ProductService to handle product, variant, and attribute management operations

app/Domains/Catalog/Services/ProductService.php

@@ -166,8 +166,12 @@ class ProductService
      */
     protected function syncImages(ProductVariant $variant, array $images): void
     {
-        // Detach any existing attachments before replacing them
+        // Detach pivot record and delete attachment from S3 and database
+        $existing = $variant->attachments()->get();
         $variant->attachments()->detach();
+        foreach ($existing as $attachment) {
+            $this->attachmentService->delete($attachment);
+        }
 
         $attachmentIds = [];