feat: 更新 .env.example 文件，新增彩票业务配置与 Redis、邮件、队列等环境变量，优化开发环境设置

app/Models/AuditLog.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Models;
+
+use App\Services\AuditLogger;
+use Illuminate\Database\Eloquent\Model;
+
+/** 运维/后台动作留痕表 audit_logs（写入请走 {@see AuditLogger}）。 */
+class AuditLog extends Model
+{
+    public const UPDATED_AT = null;
+
+    protected $table = 'audit_logs';
+
+    /** @var list<string> */
+    protected $fillable = [
+        'operator_type',
+        'operator_id',
+        'module_code',
+        'action_code',
+        'target_type',
+        'target_id',
+        'before_json',
+        'after_json',
+        'ip',
+        'user_agent',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'operator_id' => 'integer',
+            'before_json' => 'json',
+            'after_json' => 'json',
+            'created_at' => 'datetime',
+        ];
+    }
+}