fix: Double-charged shipping fee in Yoco payment + ops staff access

1. Fix Yoco payment amount calculation: order->total already includes
   shipping_fee, so don't add it again. Was charging 2x shipping.

2. Add authorization gate for ops staff access: users with is_admin=true
   can now access the ops page by scanning QR codes.

storage/framework/views/5bb74d0b4e486dbc4ccabd126c508145.php

@@ -0,0 +1,22 @@
+
+
+<?php $__env->startSection('content'); ?>
+<div class="container mx-auto px-4 py-8">
+    <div class="bg-yellow-50 border-2 border-yellow-200 rounded-lg p-8 text-center">
+        <h1 class="text-4xl font-bold text-yellow-900 mb-3">🔒 Access Denied</h1>
+        <p class="text-yellow-700 mb-6 text-lg">
+            You do not have permission to access this page. Only operations staff can view QR-based order interfaces.
+        </p>
+        <?php if(\Livewire\Mechanisms\ExtendBlade\ExtendBlade::isRenderingLivewireComponent()): ?><!--[if BLOCK]><![endif]--><?php endif; ?><?php if(auth()->check()): ?>
+            <p class="text-gray-600 mb-6">
+                Logged in as: <strong><?php echo e(auth()->user()->name); ?></strong>
+            </p>
+        <?php endif; ?><?php if(\Livewire\Mechanisms\ExtendBlade\ExtendBlade::isRenderingLivewireComponent()): ?><!--[if ENDBLOCK]><![endif]--><?php endif; ?>
+        <a href="<?php echo e(route('home')); ?>" class="inline-block bg-blue-600 hover:bg-blue-700 text-white font-bold py-2 px-6 rounded">
+            Return Home
+        </a>
+    </div>
+</div>
+<?php $__env->stopSection(); ?>
+
+<?php echo $__env->make('layouts.app', array_diff_key(get_defined_vars(), ['__data' => 1, '__path' => 1]))->render(); ?><?php /**PATH /var/www/additional_design/resources/views/ops/unauthorized.blade.php ENDPATH**/ ?>