perf: 筛选统计去掉 JSON 兜底，并补上 orders 覆盖索引

去掉 work_orders 堆访问后，JOIN 会把 orders 整表扫进 Hash Right Join。
领取页在快照新鲜时不再打上游；快手出网统一 10 秒超时。倒计时改为自适应间隔。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/frontend/src/pages/admin/panels/WorkOrdersPanel.tsx

@@ -1472,7 +1472,7 @@ export default function WorkOrdersPanel() {
               </Typography.Text>
             </Space>
             {row.status === 'in_progress' && row.deadlineAt ? (
-              <DeadlineCountdown deadlineAt={row.deadlineAt} showExpired />
+              <DeadlineCountdown deadlineAt={row.deadlineAt} />
             ) : null}
             {row.deadlineAt ? (
               <Typography.Text type="secondary">
@@ -2103,7 +2103,7 @@ export default function WorkOrdersPanel() {
                 <Descriptions.Item label="超时截止">
                   {detailOrder.deadlineAt ? (
                     <Space wrap size={8}>
-                      <DeadlineCountdown deadlineAt={detailOrder.deadlineAt} showExpired />
+                      <DeadlineCountdown deadlineAt={detailOrder.deadlineAt} />
                       <Typography.Text type="secondary">
                         {formatAdminDateTime(detailOrder.deadlineAt)}
                       </Typography.Text>