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>

resources/views/components/input-error.blade.php

@@ -0,0 +1,9 @@
+@props(['messages'])
+
+@if ($messages)
+    <ul {{ $attributes->merge(['class' => 'text-sm text-red-600 space-y-1']) }}>
+        @foreach ((array) $messages as $message)
+            <li>{{ $message }}</li>
+        @endforeach
+    </ul>
+@endif