feat(baccarat): 实现百家乐实时下注人数统计功能

- 新增 BaccaratPoolUpdated 事件，用于通过 WebSocket 广播实时下注数据更新
- 增加数据库迁移以在 baccarat_rounds 表中添加对应的下注人数统计字段
- 更新 BaccaratRound 模型以及 BaccaratController，支持实时下注统计更新与 WebSocket 事件分发
- 更新前端 chat.js 以及 baccarat-panel.blade.php，利用 Alpine.js 和 Echo 接收事件并动态渲染 "大"、"小"、"豹子" 的实时下注计数

app/Events/BaccaratPoolUpdated.php

@@ -0,0 +1,66 @@
+<?php
+
+/**
+ * 文件功能：百家乐押注人数实时广播事件
+ *
+ * 当有用户成功下注时，向房间内所有用户广播最新的
+ * 各选项下注总人次，供前端实时更新面板。
+ *
+ * @author  ChatRoom Laravel
+ *
+ * @version 1.0.0
+ */
+
+namespace App\Events;
+
+use App\Models\BaccaratRound;
+use Illuminate\Broadcasting\InteractsWithSockets;
+use Illuminate\Broadcasting\PresenceChannel;
+use Illuminate\Contracts\Broadcasting\ShouldBroadcastNow;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class BaccaratPoolUpdated implements ShouldBroadcastNow
+{
+    use Dispatchable, InteractsWithSockets, SerializesModels;
+
+    /**
+     * @param  BaccaratRound  $round  本局信息
+     */
+    public function __construct(
+        public readonly BaccaratRound $round,
+    ) {}
+
+    /**
+     * 广播至房间公共频道。
+     *
+     * @return array<int, \Illuminate\Broadcasting\Channel>
+     */
+    public function broadcastOn(): array
+    {
+        return [new PresenceChannel('room.1')];
+    }
+
+    /**
+     * 广播事件名（前端监听 .baccarat.pool_updated）。
+     */
+    public function broadcastAs(): string
+    {
+        return 'baccarat.pool_updated';
+    }
+
+    /**
+     * 广播数据。
+     *
+     * @return array<string, mixed>
+     */
+    public function broadcastWith(): array
+    {
+        return [
+            'round_id' => $this->round->id,
+            'bet_count_big' => $this->round->bet_count_big,
+            'bet_count_small' => $this->round->bet_count_small,
+            'bet_count_triple' => $this->round->bet_count_triple,
+        ];
+    }
+}

app/Http/Controllers/BaccaratController.php

@@ -56,6 +56,9 @@ class BaccaratController extends Controller
                 'total_bet_big' => $round->total_bet_big,
                 'total_bet_small' => $round->total_bet_small,
                 'total_bet_triple' => $round->total_bet_triple,
+                'bet_count_big' => $round->bet_count_big,
+                'bet_count_small' => $round->bet_count_small,
+                'bet_count_triple' => $round->bet_count_triple,
                 'my_bet' => $myBet ? [
                     'bet_type' => $myBet->bet_type,
                     'amount' => $myBet->amount,
@@ -139,9 +142,14 @@ class BaccaratController extends Controller
 
             // 更新局次汇总统计
             $field = 'total_bet_'.$data['bet_type'];
+            $countField = 'bet_count_'.$data['bet_type'];
             $round->increment($field, $data['amount']);
+            $round->increment($countField);
             $round->increment('bet_count');
 
+            // 广播各选项的最新押注人数
+            event(new \App\Events\BaccaratPoolUpdated($round));
+
             $betLabel = match ($data['bet_type']) {
                 'big' => '大', 'small' => '小', default => '豹子'
             };

app/Models/BaccaratRound.php

@@ -24,6 +24,7 @@ class BaccaratRound extends Model
         'bet_opens_at', 'bet_closes_at', 'settled_at',
         'total_bet_big', 'total_bet_small', 'total_bet_triple',
         'total_payout', 'bet_count',
+        'bet_count_big', 'bet_count_small', 'bet_count_triple',
     ];
 
     /**
@@ -44,6 +45,9 @@ class BaccaratRound extends Model
             'total_bet_triple' => 'integer',
             'total_payout' => 'integer',
             'bet_count' => 'integer',
+            'bet_count_big' => 'integer',
+            'bet_count_small' => 'integer',
+            'bet_count_triple' => 'integer',
         ];
     }