chore: initial Laravel 13 project setup for eCert MBIP

- Laravel 13.9 + PHP 8.5 + MySQL
- Bootstrap 5.3 + jQuery 3.7 + Chart.js (replacing Alpine/Tailwind)
- Packages: intervention/image, dompdf, simple-qrcode, league/csv, laravel/breeze, laravel/boost
- 17 database migrations: users, programs, qr_codes, participants, attendances, certificates, questionnaires, email_logs, audit_logs
- 13 Eloquent models with full relationships
- Admin layout (Bootstrap 5 sidebar) + public layout (mobile-first)
- Rate limiters: checkin (60/min), certificate (30/min)
- Admin seeder: admin@mbip.gov.my
- Storage directories + symlink configured

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

app/Models/AuditLog.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class AuditLog extends Model
+{
+    protected $fillable = [
+        'user_id', 'action', 'auditable_type', 'auditable_id',
+        'old_values', 'new_values', 'ip_address', 'user_agent',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'old_values' => 'array',
+            'new_values' => 'array',
+        ];
+    }
+
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function auditable()
+    {
+        return $this->morphTo();
+    }
+}