feat(game): 添加游戏准备状态功能

- 在 SeatPlayerCard 组件中添加 isReady 属性用于显示准备状态
- 添加准备/取消准备按钮，支持玩家切换准备状态
- 实现 WebSocket 消息处理以同步玩家准备状态
- 添加 CSS 样式显示准备状态标签和准备按钮
- 优化用户 ID 解析逻辑，支持多种字段格式
- 修复座位索引计算逻辑，确保相对位置正确显示
- 添加认证会话管理功能，确保用户信息同步加载
- 实现房间玩家状态更新的消息处理机制

src/assets/styles/room.css

@@ -429,6 +429,22 @@
   color: #eef5ff;
 }
 
+.picture-scene .player-meta .ready-chip {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  margin-top: 4px;
+  padding: 1px 8px;
+  border-radius: 999px;
+  color: #f7f2dd;
+  font-size: 10px;
+  font-weight: 700;
+  background: linear-gradient(180deg, rgba(214, 173, 58, 0.82), rgba(125, 91, 20, 0.92));
+  box-shadow:
+    inset 0 1px 0 rgba(255, 255, 255, 0.22),
+    0 2px 6px rgba(0, 0, 0, 0.2);
+}
+
 .picture-scene .player-badge.seat-right .player-meta,
 .picture-scene .player-badge.seat-left .player-meta {
   display: flex;
@@ -575,6 +591,57 @@
   pointer-events: none;
 }
 
+.ready-toggle {
+  position: absolute;
+  right: 120px;
+  bottom: 70px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  min-width: 138px;
+  height: 44px;
+  padding: 0 16px 0 14px;
+  border: 1px solid rgba(220, 191, 118, 0.24);
+  border-radius: 999px;
+  background:
+    linear-gradient(180deg, rgba(14, 55, 40, 0.92), rgba(8, 36, 27, 0.96)),
+    radial-gradient(circle at 20% 24%, rgba(237, 214, 157, 0.08), transparent 34%);
+  box-shadow:
+    inset 0 1px 0 rgba(255, 244, 214, 0.1),
+    inset 0 -1px 0 rgba(0, 0, 0, 0.22),
+    0 8px 18px rgba(0, 0, 0, 0.2);
+  z-index: 4;
+  animation: ready-toggle-pop 180ms ease-out;
+}
+
+.ready-toggle-label {
+  color: #e5c472;
+  font-size: 14px;
+  font-weight: 800;
+  letter-spacing: 0.5px;
+  text-shadow:
+    -1px 0 rgba(0, 0, 0, 0.38),
+    0 1px rgba(0, 0, 0, 0.38),
+    1px 0 rgba(0, 0, 0, 0.38),
+    0 -1px rgba(0, 0, 0, 0.38);
+}
+
+.ready-toggle:active {
+  transform: translateY(1px) scale(0.96);
+}
+
+@keyframes ready-toggle-pop {
+  from {
+    opacity: 0;
+    transform: translateY(10px) scale(0.94);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+}
+
 .center-desk {
   position: absolute;
   left: 50%;