Build real shop/menu/booking storefronts (replace church giving UI).

The storefront create/edit/manage UI and the public storefront page were
give's church-donation flow relabeled. Replace with genuine merchant
storefronts, reusing the QR-core manager + validator (which already build
sections/services content):

- Merchant create: type picker (shop/menu/booking) + per-type editors in a
  shared partial (products/menu items with prices; bookable services with
  days/hours). x-if per type so inputs never collide across types.
- StorefrontController store/update/create now delegate to QrCodeManagerService
  for all three types (was hardcoded church org_type/denomination/collection).
- Storefront show = QR preview + download + live toggle + delete + full editor.
- QrCodeManagerService: shop/menu/booking are free (no QR-wallet gate); drop
  the duplicate church TYPE_SHOP arm in hasContentChanges.
- Public: new storefront catalog+cart view for shop/menu (posts items[] to the
  existing order/Pay flow); route shop+menu to it. Booking already had a real
  public page; church TYPE_SHOP landing branch retired.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Http/Controllers/Public/QrScanController.php

@@ -43,6 +43,10 @@ class QrScanController extends Controller
             return view('public.qr.booking-landing', ['qrCode' => $qrCode]);
         }
 
+        if ($qrCode->isShopType() || $qrCode->isMenuType()) {
+            return view('public.qr.storefront', ['qrCode' => $qrCode]);
+        }
+
         if ($qrCode->usesLandingPage()) {
             return view('public.qr.landing', ['qrCode' => $qrCode]);
         }