feat(chat): 完善五子棋功能，包含AI对战、PvP邀请、断线重连及界面美化

app/Events/GomokuInviteEvent.php

@@ -0,0 +1,67 @@
+<?php
+
+/**
+ * 文件功能：五子棋对战邀请广播事件
+ *
+ * 玩家发起对战邀请时广播至房间 Presence 频道，
+ * 前端在聊天消息流中渲染「接受挑战」按钮。
+ *
+ * @author  ChatRoom Laravel
+ *
+ * @version 1.0.0
+ */
+
+namespace App\Events;
+
+use App\Models\GomokuGame;
+use Illuminate\Broadcasting\InteractsWithSockets;
+use Illuminate\Broadcasting\PresenceChannel;
+use Illuminate\Contracts\Broadcasting\ShouldBroadcastNow;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class GomokuInviteEvent implements ShouldBroadcastNow
+{
+    use Dispatchable, InteractsWithSockets, SerializesModels;
+
+    /**
+     * @param  GomokuGame  $game  对局记录
+     * @param  string  $inviterName  发起者用户名
+     */
+    public function __construct(
+        public readonly GomokuGame $game,
+        public readonly string $inviterName,
+    ) {}
+
+    /**
+     * 广播至对应房间频道。
+     *
+     * @return array<\Illuminate\Broadcasting\Channel>
+     */
+    public function broadcastOn(): array
+    {
+        return [new PresenceChannel("room.{$this->game->room_id}")];
+    }
+
+    /**
+     * 广播事件名（前端监听 .gomoku.invite）。
+     */
+    public function broadcastAs(): string
+    {
+        return 'gomoku.invite';
+    }
+
+    /**
+     * 广播数据。
+     *
+     * @return array<string, mixed>
+     */
+    public function broadcastWith(): array
+    {
+        return [
+            'game_id' => $this->game->id,
+            'inviter_name' => $this->inviterName,
+            'expires_at' => $this->game->invite_expires_at?->toIso8601String(),
+        ];
+    }
+}