feat(i18n): 添加主页国际化支持并优化语言切换

- 添加主页相关翻译键（guest, onlineCount, loading等）
- 修改主页使用 $lang 动态显示文本
- 分类名称改为使用 nameKey 映射到语言文件
- 添加 URL 参数语言检测（App.vue onLaunch）
- GamePortrait 返回时保留语言参数

支持语言：cn, tw, en, yn, kr, tl, in

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

pages/index.vue

@@ -11,7 +11,7 @@
           <view class="user-avatar">
              <u-icon name="account-fill" color="#fff" size="24"></u-icon>
           </view>
-          <text class="username">{{ userInfo.username || 'Guest' }}</text>
+          <text class="username">{{ userInfo.username || $lang.guest }}</text>
           <view class="balance-pill">
             <u-icon name="rmb-circle-fill" color="#f4c46f" size="16"></u-icon>
             <text class="balance-text">{{ userInfo.money || '0.00' }}</text>
@@ -45,13 +45,13 @@
              <image :src="cat.icon" mode="widthFix" style="width: 24px; height: 24px;" v-if="cat.icon" />
              <u-icon :name="cat.uIcon" color="#ccc" size="28" v-else></u-icon>
           </view>
-          <text class="cat-name">{{ cat.name }}</text>
+          <text class="cat-name">{{ $lang[cat.nameKey] }}</text>
           <text class="cat-count">({{ getCategoryCount(cat.id) }})</text>
         </view>
        
         <!-- Online Count Bottom -->
         <view class="online-count-box">
-           <text class="label">在线人数</text>
+           <text class="label">{{ $lang.onlineCount }}</text>
            <text class="count">2506</text>
         </view>
       </scroll-view>
@@ -60,7 +60,7 @@
       <scroll-view scroll-y class="content-area">
         <view class="table-list">
            <view class="loading-state" v-if="loading">
-             <u-loading-icon color="#f4c46f" vertical text="Loading..."></u-loading-icon>
+             <u-loading-icon color="#f4c46f" vertical :text="$lang.loading"></u-loading-icon>
            </view>
            
            <view 
@@ -75,7 +75,7 @@
                  <text class="table-name">{{ item.table_name }}</text>
                </view>
                <view class="header-right">
-                 <text class="limit-info">上限:50000 下限:20</text>
+                 <text class="limit-info">{{ $lang.maxLimit }}:50000 {{ $lang.minLimit }}:20</text>
                  <view class="status-dot" :class="{ 'is-live': item.status===1 }"></view>
                </view>
              </view>
@@ -138,15 +138,10 @@ export default {
       ],
       currentCategory: 0, // 0 = All or default category
       categories: [
-          /*
-        { id: 0, name: '国际厅', uIcon: 'grid', gameIds: [1,2,3,4,5] },
-        { id: 1, name: '旗舰厅', uIcon: 'star', gameIds: [1] },
-        */
         // Mapping based on common IDs: 1=Baccarat, 2=DT, 4=Bull, 5=ThreeCard
-        { id: 1, name: '百家乐', uIcon: 'chrome-circle-fill', gameIds: [1] },
-        { id: 2, name: '龙虎', uIcon: 'heart-fill', gameIds: [2] },
-        { id: 4, name: '牛牛', uIcon: 'thumb-up-fill', gameIds: [4] },
-        // { id: 5, name: '金花/其他', uIcon: 'plus-circle-fill', gameIds: [5] }, // Grouping others
+        { id: 1, nameKey: 'baccarat', uIcon: 'chrome-circle-fill', gameIds: [1] },
+        { id: 2, nameKey: 'longhu', uIcon: 'heart-fill', gameIds: [2] },
+        { id: 4, nameKey: 'niuniu', uIcon: 'thumb-up-fill', gameIds: [4] },
       ],
       allTables: [],
       loading: false,
@@ -161,6 +156,7 @@ export default {
     ...mapState({
       storeUserInfo: (state) => state.app.userInfo,
       language: (state) => state.app.language,
+      $lang: (state) => state.app.lang[state.app.language],
     }),
     filteredTables() {
         if (!this.allTables.length) return [];
@@ -261,9 +257,9 @@ export default {
         return 'status-dealing';
     },
     getStatusText(status) {
-        if (status === 1) return '下注中';
-        if (status === 2) return '发牌中';
-        return '准备中';
+        if (status === 1) return this.$lang.betting;
+        if (status === 2) return this.$lang.dealing;
+        return this.$lang.preparing;
     },
     enterGame(item) {
         // 跳转到同域名下的 /game 子目录