feat(cart): implement cart management with add, update, and remove item functionalities

app/Domains/Cart/Requests/AddCartItemRequest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Domains\Cart\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class AddCartItemRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function rules(): array
+    {
+        return [
+            'product_variant_id' => ['required', 'integer'],
+            'cantidad' => ['required', 'integer', 'min:1'],
+        ];
+    }
+}