feat: add domain registration form and email notifications

- Create a new Blade view for domain registration (`registrant-tochuc.blade.php`) to capture organization and manager details.
- Implement email templates for new domain orders for both admin (`domain-order-new.blade.php`) and customers (`domain-order-received.blade.php`).
- Add CSV exports for client and domain data.
- Introduce tests for customer mass assignment, password reset, login throttling, and permission gating.
- Ensure service renewals use current pricing and validate ownership for virtual machines.
- Validate mass assignment behavior in service model.

app/Mail/Customer/DomainOrderReceivedNotification.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Mail\Customer;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Mail\Mailable;
+use Illuminate\Mail\Mailables\Content;
+use Illuminate\Mail\Mailables\Envelope;
+use Illuminate\Queue\SerializesModels;
+
+class DomainOrderReceivedNotification extends Mailable implements ShouldQueue
+{
+    use Queueable, SerializesModels;
+
+    public function __construct(
+        protected array $data,
+    ) {}
+
+    public function envelope(): Envelope
+    {
+        return new Envelope(
+            subject: "Đơn đăng ký tên miền {$this->data['domain_name']} đã được ghi nhận",
+        );
+    }
+
+    public function content(): Content
+    {
+        return new Content(
+            view: 'emails.layouts.notification',
+            with: [
+                'companyName' => $this->data['company_name'] ?? config('app.name'),
+                'title'       => 'Đơn đăng ký tên miền đã được ghi nhận',
+                'body'        => view('emails.customer.domain-order-received', $this->data)->render(),
+            ],
+        );
+    }
+}