feat: 全页面增加营业收入/优惠指标 + 修复趋势预测空数据 + 区域对比口径统一 + StorePage最新经营日概览

- 后端: 所有API的discount改为从bill_fact累计discount_total
- 后端: revenue/daily-summary增加consumption字段
- 后端: situational-awareness/forecast修复c175字符串比较为timestamp
- 后端: region/comparison去掉未知区域排除，统一口径
- 后端: daily-card增加营业收入/优惠指标，返回target_date/baseline_date
- 前端: BossPage/DashboardPage/BankPage/StorePage/ExpenseOverviewTab/RegionalPage/RegionComparisonPage/RevenuePage 均增加营业收入和优惠指标卡
- 前端: StorePage日均经营概览改为最新经营日概览，显示具体对比日期
- 前端: 日期格式统一截取YYYY-MM-DD显示

client/src/components/store-expense/ExpenseOverviewTab.tsx

@@ -21,10 +21,12 @@ export function ExpenseOverviewTab({ month }: { month: string }) {
 
   return (
     <div className="space-y-4">
-      <div className="grid grid-cols-2 md:grid-cols-4 gap-3">
-        <MetricCard title="经营门店" value={ov.total_stores} unit="家" description={`${ov.profitable_stores}家盈利 / ${ov.loss_stores}家亏损`} />
+      <div className="grid grid-cols-2 md:grid-cols-3 lg:grid-cols-6 gap-3">
+        <MetricCard title="营业收入" value={ov.total_consumption} format="currency" description="全部门店消费金额合计" />
+        <MetricCard title="优惠" value={ov.total_discount} format="currency" description="各类优惠扣减合计" />
         <MetricCard title="实收合计" value={ov.total_received} format="currency" description={`费用合计 ${formatCurrency(ov.total_expense)}`} />
         <MetricCard title="门店贡献利润" value={ov.total_contribution} format="currency" description={`贡献率 ${formatPercent(ov.overall_contribution_rate_pct)}`} />
+        <MetricCard title="经营门店" value={ov.total_stores} unit="家" description={`${ov.profitable_stores}家盈利 / ${ov.loss_stores}家亏损`} />
         <MetricCard title="费用率" value={ov.overall_expense_rate_pct} format="percent" description={`人工 ${formatPercent(ov.overall_wage_rate_pct)} · 房租 ${formatPercent(ov.overall_rent_rate_pct)}`} />
       </div>