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/Support/Qr/QrCoverImageSpec.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Support\Qr;
+
+class QrCoverImageSpec
+{
+    /** Wide hero banners (business, church, event, itinerary, menu, shop). */
+    public const BANNER = '1920×1080 px (16:9 landscape)';
+
+    /** Book product cover on the landing page. */
+    public const BOOK = '800×1067 px (3:4 portrait)';
+
+    public static function label(string $variant = 'banner'): string
+    {
+        return match ($variant) {
+            'book' => self::BOOK,
+            default => self::BANNER,
+        };
+    }
+}