Add feature tests for domain order management

- Implement AdminDomainOrderTest to cover admin functionalities for domain orders including listing, confirming registration, KYC updates, activation, rejection, and refunds.
- Implement ClientDomainOrderTest to cover client functionalities for placing domain orders, including validation for balance, duplicate orders, and domain normalization.
- Ensure proper handling of domain pricing and service statuses throughout the tests.

app/Http/Requests/Api/Client/Domain/StoreDomainOrderRequest.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Http\Requests\Api\Client\Domain;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreDomainOrderRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'product_uuid' => ['required', 'string'],
+            'domain_name'  => ['required', 'string', 'max:255'],
+            'years'        => ['nullable', 'integer', 'min:1', 'max:3'],
+        ];
+    }
+
+    /** Default years to 1 if omitted. */
+    protected function prepareForValidation(): void
+    {
+        if (!$this->has('years') || $this->years === null) {
+            $this->merge(['years' => 1]);
+        }
+    }
+}