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>

config/notifications.php

@@ -0,0 +1,17 @@
+<?php
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | FCM push for Ladill Mini Android
+    |--------------------------------------------------------------------------
+    |
+    | Sellers receive instant payment alerts when a device token is registered
+    | and the account was active in the app within this window.
+    |
+    */
+
+    'fcm_active_user_within_days' => (int) env('NOTIFICATIONS_FCM_ACTIVE_USER_DAYS', 60),
+
+];