fix: 财务管理站点账户卡片改为显示账户信息而非营收信息

将站点账户下方的"今日营收/本月营收/累计营收"改为后端实际返回的：
- 可提现金额 (availableBalance)
- 提现冻结 (withdrawnFrozenAmount)
- 已提现金额 (withdrawnAmount)

此前显示的营收字段在 StationAccountVo 中不存在，始终显示 0.00。

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

admin-h5/src/pages/finance/index.vue

@@ -93,16 +93,16 @@
           <view class="account-content">
             <view class="account-stats">
               <view class="stat-column">
-                <text class="stat-period">今日营收</text>
-                <text class="stat-amount">¥{{ formatAmount(account.todayRevenue || 0) }}</text>
+                <text class="stat-period">可提现金额</text>
+                <text class="stat-amount">¥{{ formatAmount(account.availableBalance || 0) }}</text>
               </view>
               <view class="stat-column">
-                <text class="stat-period">本月营收</text>
-                <text class="stat-amount">¥{{ formatAmount(account.monthRevenue || 0) }}</text>
+                <text class="stat-period">提现冻结</text>
+                <text class="stat-amount">¥{{ formatAmount(account.withdrawnFrozenAmount || 0) }}</text>
               </view>
               <view class="stat-column">
-                <text class="stat-period">累计营收</text>
-                <text class="stat-amount">¥{{ formatAmount(account.totalRevenue || 0) }}</text>
+                <text class="stat-period">已提现金额</text>
+                <text class="stat-amount">¥{{ formatAmount(account.withdrawnAmount || 0) }}</text>
               </view>
             </view>
             <button class="withdraw-btn" @click="navigateToWithdraw(account)">