feat: 添加扫雷游戏在线人数显示及定时更新功能

pages-game/game/minesweeper/play.scss

@@ -375,6 +375,16 @@
     font-weight: 500;
 }
 
+.online-number {
+    color: $accent-orange;
+    font-weight: 700;
+    font-size: 36rpx;
+}
+
+.online-count-row {
+    margin-top: $spacing-sm;
+}
+
 // 按钮使用全局定义
 .start-btn {
     width: 380rpx;

pages-game/game/minesweeper/play.vue

@@ -53,6 +53,10 @@
               <text class="intro-icon">🏆</text>
               <text class="intro-text">胜者赢取全额奖励</text>
             </view>
+            <view class="intro-item online-count-row">
+              <text class="intro-icon">👥</text>
+              <text class="intro-text">当前在线: <text class="online-number">{{ onlineCount }}</text> 人</text>
+            </view>
           </view>
           
           <view class="btn-primary start-btn" @tap="startMatchmaking">
@@ -329,6 +333,8 @@ export default {
       showSettlement: false,
       settlementWinnerId: '',
       showResultModal: false,
+      onlineCount: 0,
+      onlineCountInterval: null,
       // Timers
       matchInterval: null,
       turnInterval: null,
@@ -482,6 +488,10 @@ export default {
         this.addLog('system', '✅ 已连接到远程节点');
         this.setupSocketListeners();
         
+        // 获取在线人数
+        this.fetchOnlineCount();
+        this.onlineCountInterval = setInterval(() => this.fetchOnlineCount(), 10000);
+        
         // 跨设备对局发现逻辑：调用 RPC 询问服务器我当前是否有正在进行的战局
         if (!this.matchId) {
           try {
@@ -862,8 +872,19 @@ export default {
     cleanup() {
       clearInterval(this.matchInterval);
       clearInterval(this.turnInterval);
+      clearInterval(this.onlineCountInterval);
       nakamaManager.disconnect();
     },
+    async fetchOnlineCount() {
+      try {
+        const result = await nakamaManager.rpc('get_online_count', {});
+        if (result && typeof result.online_count === 'number') {
+          this.onlineCount = result.online_count;
+        }
+      } catch (e) {
+        console.warn('获取在线人数失败:', e);
+      }
+    },
     getItemIcon(itemId) {
       const map = { medkit: '💊', bomb_timer: '⏰', poison: '☠️', shield: '🛡️', skip: '⏭️', magnifier: '🔍', knife: '🔪', revive: '💖', lightning: '⚡', chest: '📦', curse: '👻' };
       return map[itemId] || '🎁';