feat(adminfinance): 新增预计收入指标并优化明细查询性能

- 财务看板增加预计收入与待结算订单数统计
- 明细列表 COUNT 改为仅扫描 rental_orders 主表，避免 5-JOIN 子查询
- 统一前后端结算差异判定阈值为常量 5 分
- 修复日期选择器使用 UTC 日期导致东八区凌晨偏移前一天的问题

frontend/src/features/admin/views/AdminFinanceDashboardView.vue

@@ -4,11 +4,12 @@ import { computed, onMounted, reactive, ref } from 'vue'
 
 import {
   fetchFinanceDashboard,
+  SETTLEMENT_DIFF_THRESHOLD_CENT,
   type FinanceDashboard,
   type FinanceDailyItem,
 } from '@/features/admin/api/adminFinance'
 import { formatCentWithSymbol } from '@/shared/utils/money'
-import { formatDateTime } from '@/shared/utils/time'
+import { formatDateTime, formatInputDate } from '@/shared/utils/time'
 
 const loading = ref(false)
 const dashboard = ref<FinanceDashboard | null>(null)
@@ -44,16 +45,14 @@ function defaultEndDate() {
   return formatInputDate(new Date())
 }
 
-function formatInputDate(date: Date) {
-  return date.toISOString().slice(0, 10)
-}
-
 function diffType(value: number) {
-  return Math.abs(Number(value || 0)) >= 5 ? 'danger' : 'success'
+  return Math.abs(Number(value || 0)) >= SETTLEMENT_DIFF_THRESHOLD_CENT ? 'danger' : 'success'
 }
 
 function rowDiffClass(row: FinanceDailyItem) {
-  return Math.abs(Number(row.settlement_diff_amount_cent || 0)) >= 5 ? 'amount-danger' : ''
+  return Math.abs(Number(row.settlement_diff_amount_cent || 0)) >= SETTLEMENT_DIFF_THRESHOLD_CENT
+    ? 'amount-danger'
+    : ''
 }
 </script>
 
@@ -130,6 +129,11 @@ function rowDiffClass(row: FinanceDailyItem) {
         </strong>
         <small>{{ dashboard.summary.financial_exception_count }} 个异常订单</small>
       </div>
+      <div class="metric-card">
+        <span>预计收入</span>
+        <strong>{{ moneyCent(dashboard.summary.estimated_income_amount_cent) }}</strong>
+        <small>{{ dashboard.summary.pending_settle_order_count }} 个待结算订单</small>
+      </div>
     </div>
 
     <el-table v-loading="loading" class="table-panel" :data="dailyItems">
@@ -157,11 +161,17 @@ function rowDiffClass(row: FinanceDailyItem) {
           <span :class="rowDiffClass(row)">{{ moneyCent(row.settlement_diff_amount_cent) }}</span>
         </template>
       </el-table-column>
-      <el-table-column label="收款/退款/结算" min-width="170">
-        <template #default="{ row }">
-          {{ row.successful_pay_count }} / {{ row.successful_refund_count }} /
-          {{ row.settled_order_count }}
-        </template>
+      <el-table-column label="预计收入" width="130">
+        <template #default="{ row }">{{ moneyCent(row.estimated_income_amount_cent) }}</template>
+      </el-table-column>
+      <el-table-column label="销售数量" width="110">
+        <template #default="{ row }">{{ row.successful_pay_count }}</template>
+      </el-table-column>
+      <el-table-column label="退款数量" width="110">
+        <template #default="{ row }">{{ row.successful_refund_count }}</template>
+      </el-table-column>
+      <el-table-column label="结算数量" width="110">
+        <template #default="{ row }">{{ row.settled_order_count }}</template>
       </el-table-column>
     </el-table>