feat(catalog): resolve options from partial variant selections

app/Domains/Catalog/Requests/CatalogVariantOptionsRequest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Domains\Catalog\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class CatalogVariantOptionsRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /** @return array<string, list<string>> */
+    public function rules(): array
+    {
+        return [
+            'selected_values' => ['sometimes', 'array'],
+            'selected_values.*' => ['nullable'],
+            'excluded_variant_ids' => ['sometimes', 'array'],
+            'excluded_variant_ids.*' => ['integer', 'min:1', 'distinct'],
+            'cart_item_id' => ['sometimes', 'nullable', 'integer', 'min:1'],
+        ];
+    }
+}