Fix systemic extraction breakage in authenticated UI.

The give→merchant transform left several independent breakages that 500'd
once a logged-in user hit the pages:

- /storefronts/{create,show,update,...} were wired to Qr\QrCodeController,
  which renders events-lineage qr-codes.* views referencing 14 undefined
  events.* routes. Rewire to StorefrontController (clean storefronts.* views).
- storefronts/show.blade.php @include('give.storefronts.partials.*') — the
  view dir was renamed give→merchant but the include namespace wasn't.
- /payouts + /search queried qr_sale_orders.*_minor; migration created *_ghs.
- Remove dead GiveDonation model (nonexistent give_donations table).

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

app/Http/Controllers/Merchant/PayoutsController.php

@@ -22,10 +22,10 @@ class PayoutsController extends Controller
             ->where('type', QrCode::TYPE_SHOP)
             ->pluck('id');
 
-        $revenueMinor = (int) QrSaleOrder::query()
+        $revenueMinor = (int) round(QrSaleOrder::query()
             ->whereIn('qr_code_id', $qrIds)
             ->where('status', QrSaleOrder::STATUS_PAID)
-            ->sum('merchant_amount_minor');
+            ->sum('merchant_amount_ghs') * 100);
 
         $balanceMinor = 0;
         try {