Add Ladill POS v1 — register, Pay checkout, and commerce links.

Staff-facing counter register at pos.ladill.com with catalog cart, cash and
MoMo/card checkout via Ladill Pay, CRM timeline/import, invoice prefill, and
Merchant catalog import.

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

app/Notifications/Mini/MiniAlertNotification.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Notifications\Mini;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Notification;
+
+class MiniAlertNotification extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    /**
+     * @param  array<string, mixed>  $extra
+     */
+    public function __construct(
+        private readonly string $title,
+        private readonly string $message,
+        private readonly string $icon,
+        private readonly ?string $url,
+        private readonly string $milestone,
+        private readonly array $extra = [],
+    ) {}
+
+    /** @return list<string> */
+    public function via(object $notifiable): array
+    {
+        return ['database'];
+    }
+
+    /** @return array<string, mixed> */
+    public function toArray(object $notifiable): array
+    {
+        return array_merge([
+            'title' => $this->title,
+            'message' => $this->message,
+            'icon' => $this->icon,
+            'url' => $this->url,
+            'milestone' => $this->milestone,
+        ], $this->extra);
+    }
+}