Extract Ladill QR Plus as standalone app at qr.ladill.com.

Utility QR types only (URL, WiFi, link list, business, app download) with
SSO, Billing API integration, public /q resolver, and qr-plus:import for
platform migration. vCard and commerce types stay on the platform.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Notifications/HostingResourceWarningNotification.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Models\HostingAccount;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class HostingResourceWarningNotification extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    public function __construct(
+        private readonly HostingAccount $account,
+        private readonly string $subjectLine,
+        private readonly string $messageBody
+    ) {
+    }
+
+    public function via($notifiable): array
+    {
+        return ['mail', 'database'];
+    }
+
+    public function toMail($notifiable): MailMessage
+    {
+        return (new MailMessage())
+            ->subject($this->subjectLine)
+            ->greeting('Hosting resource update')
+            ->line($this->messageBody)
+            ->line('Domain: ' . ($this->account->primary_domain ?: $this->account->username))
+            ->line('Resource state: ' . ucfirst((string) ($this->account->resource_status ?: 'active')))
+            ->action('Manage Hosting', route('hosting.accounts.show', $this->account));
+    }
+
+    public function toArray($notifiable): array
+    {
+        return [
+            'title' => $this->subjectLine,
+            'message' => $this->messageBody,
+            'icon' => 'hosting',
+            'url' => route('hosting.accounts.show', $this->account),
+        ];
+    }
+}