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>

routes/api.php

@@ -0,0 +1,6 @@
+<?php
+
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Route;
+
+Route::middleware('auth:sanctum')->get('/v1/me', fn (Request $request) => $request->user());