feat: implement product and variant CRUD management service with attachment handling

app/Domains/Catalog/Requests/ProductDetailRequest.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Domains\Catalog\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class ProductDetailRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function rules(): array
+    {
+        return [
+            'variant_id' => ['sometimes', 'integer'],
+        ];
+    }
+}