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/Certificate.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Str;
+
+class Certificate extends Model
+{
+    protected $fillable = [
+        'uuid', 'program_id', 'participant_id', 'certificate_template_id',
+        'certificate_no', 'file_path', 'token', 'status', 'error_message',
+        'generated_at', 'emailed_at', 'downloaded_at', 'download_count',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'generated_at'   => 'datetime',
+            'emailed_at'     => 'datetime',
+            'downloaded_at'  => 'datetime',
+            'download_count' => 'integer',
+        ];
+    }
+
+    protected static function boot(): void
+    {
+        parent::boot();
+        static::creating(function ($model) {
+            $model->uuid  ??= (string) Str::uuid();
+            $model->token ??= Str::random(48);
+        });
+    }
+
+    public function program()
+    {
+        return $this->belongsTo(Program::class);
+    }
+
+    public function participant()
+    {
+        return $this->belongsTo(Participant::class);
+    }
+
+    public function template()
+    {
+        return $this->belongsTo(CertificateTemplate::class, 'certificate_template_id');
+    }
+
+    public function emailLogs()
+    {
+        return $this->hasMany(EmailLog::class);
+    }
+
+    public function isGenerated(): bool
+    {
+        return $this->status === 'generated' || $this->status === 'emailed' || $this->status === 'downloaded';
+    }
+
+    public function recordDownload(): void
+    {
+        $this->increment('download_count');
+        if (! $this->downloaded_at) {
+            $this->update(['downloaded_at' => now(), 'status' => 'downloaded']);
+        }
+    }
+}