refactor：拆分 API 路由与请求校验，统一 final 类和代码风格

app/Services/Draw/LotteryHallRealtimeBroadcaster.php

@@ -3,8 +3,8 @@
 namespace App\Services\Draw;
 
 use App\Events\DrawCountdownBroadcast;
-use App\Events\DrawResultPublishedBroadcast;
 use App\Events\DrawStatusChangeBroadcast;
+use App\Events\DrawResultPublishedBroadcast;
 
 /**
  * 对齐界面文档 §2.1：`draw.countdown`、`draw.status_change`、`result.published`（频道 `lottery-hall`）。