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>

app/Models/QrTransaction.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class QrTransaction extends Model
+{
+    public const TYPE_CREDIT = 'credit';
+    public const TYPE_DEBIT = 'debit';
+
+    protected $fillable = [
+        'user_id',
+        'qr_wallet_id',
+        'qr_code_id',
+        'type',
+        'amount_ghs',
+        'balance_after_ghs',
+        'reference',
+        'status',
+        'description',
+        'metadata',
+    ];
+
+    protected $casts = [
+        'amount_ghs' => 'decimal:4',
+        'balance_after_ghs' => 'decimal:4',
+        'metadata' => 'array',
+    ];
+
+    public function wallet(): BelongsTo
+    {
+        return $this->belongsTo(QrWallet::class, 'qr_wallet_id');
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function qrCode(): BelongsTo
+    {
+        return $this->belongsTo(QrCode::class);
+    }
+}