fix: QR code guna Storage::disk('public') — imej tidak papar di admin panel

Storage::put() guna default disk (local/private) menyebabkan fail disimpan
di storage/app/private/public/qrcodes/ tapi URL /storage/qrcodes/... cari
fail di storage/app/public/qrcodes/ melalui symlink — lokasi berbeza.

- QrCodeService: guna disk('public'), path ringkas 'qrcodes/{token}.png'
- View: Storage::disk('public')->url() untuk URL yang betul

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

resources/views/admin/programs/qr.blade.php

@@ -22,7 +22,7 @@
                 @if($qrCode)
                 {{-- QR Code Image --}}
                 <div class="mb-4">
-                    <img src="{{ Storage::url($qrCode->qr_image_path) }}"
+                    <img src="{{ Storage::disk('public')->url($qrCode->qr_image_path) }}"
                          alt="QR Code {{ $program->title }}"
                          class="img-fluid border rounded p-2"
                          style="max-width: 280px;">