feat: 添加 Laravel Reverb 支持，更新 .env.example 文件以配置 WebSocket，增强彩票调度功能，更新 API 路由以支持期号管理与结果发布

app/Console/Commands/LotteryHallCountdownCommand.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Services\Draw\LotteryHallRealtimeBroadcaster;
+use Illuminate\Console\Command;
+
+class LotteryHallCountdownCommand extends Command
+{
+    protected $signature = 'lottery:hall-countdown';
+
+    protected $description = '大厅 countdown WebSocket：`draw.countdown`（每秒；见界面文档 §2.1）';
+
+    public function handle(LotteryHallRealtimeBroadcaster $broadcaster): int
+    {
+        $broadcaster->countdownPulse();
+
+        return self::SUCCESS;
+    }
+}