feat: refactor cart and bundle handling to support Buyable interface for improved flexibility

app/Domains/Cart/Requests/AddCartItemRequest.php

@@ -17,7 +17,8 @@ class AddCartItemRequest extends FormRequest
     public function rules(): array
     {
         return [
-            'product_variant_id' => ['required', 'integer'],
+            'buyable_type' => ['required', 'string', \Illuminate\Validation\Rule::in(['variant', 'bundle'])],
+            'buyable_id' => ['required', 'integer'],
             'cantidad' => ['required', 'integer', 'min:1'],
         ];
     }