Feat: 实现全屏特效系统（烟花/下雨/雷电），管理员一键触发全房间广播

app/Events/EffectBroadcast.php

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+<?php
+
+/**
+ * 文件功能：聊天室全屏特效广播事件
+ *
+ * 管理员触发烟花/下雨/雷电等特效后，
+ * 通过 WebSocket 广播给房间内所有在线用户，前端收到后播放对应 Canvas 动画。
+ *
+ * @package  App\Events
+ * @author   ChatRoom Laravel
+ * @version  1.0.0
+ */
+
+namespace App\Events;
+
+use Illuminate\Broadcasting\InteractsWithSockets;
+use Illuminate\Broadcasting\PresenceChannel;
+use Illuminate\Contracts\Broadcasting\ShouldBroadcastNow;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class EffectBroadcast implements ShouldBroadcastNow
+{
+    use Dispatchable, InteractsWithSockets, SerializesModels;
+
+    /**
+     * 支持的特效类型列表（用于校验）
+     */
+    public const TYPES = ['fireworks', 'rain', 'lightning'];
+
+    /**
+     * 构造函数
+     *
+     * @param  int     $roomId    房间 ID
+     * @param  string  $type      特效类型：fireworks / rain / lightning
+     * @param  string  $operator  触发特效的管理员用户名
+     */
+    public function __construct(
+        public readonly int $roomId,
+        public readonly string $type,
+        public readonly string $operator,
+    ) {}
+
+    /**
+     * 广播频道：向房间内所有在线用户推送
+     *
+     * @return array<int, \Illuminate\Broadcasting\Channel>
+     */
+    public function broadcastOn(): array
+    {
+        return [
+            new PresenceChannel('room.' . $this->roomId),
+        ];
+    }
+
+    /**
+     * 广播数据：特效类型和操作者
+     *
+     * @return array<string, mixed>
+     */
+    public function broadcastWith(): array
+    {
+        return [
+            'type'     => $this->type,
+            'operator' => $this->operator,
+        ];
+    }
+}