sync(theme-4): 从 main 同步优胜赛结算态与钱包流水展示优化

- checkout shared/api/admin 自 d3c2114
- player: outright 结算态逻辑、wallet txAmountClass、i18n 新增 key（保留海军蓝主题样式）

apps/admin/src/utils/format-datetime.ts

@@ -0,0 +1,39 @@
+import { getAdminLocale } from '../i18n';
+import type { AdminLocale } from '../i18n/admin-messages';
+
+function resolveLocale(locale?: AdminLocale): AdminLocale {
+  return locale ?? getAdminLocale();
+}
+
+/** 列表展示：年月日 */
+export function formatAdminDateTimeBrief(
+  value: string | null | undefined,
+  locale?: AdminLocale,
+): string {
+  if (!value) return '—';
+  const d = new Date(value);
+  if (Number.isNaN(d.getTime())) return '—';
+  return d.toLocaleString(resolveLocale(locale), {
+    year: 'numeric',
+    month: '2-digit',
+    day: '2-digit',
+  });
+}
+
+/** 悬停详情：含秒 */
+export function formatAdminDateTimeFull(
+  value: string | null | undefined,
+  locale?: AdminLocale,
+): string {
+  if (!value) return '—';
+  const d = new Date(value);
+  if (Number.isNaN(d.getTime())) return '—';
+  return d.toLocaleString(resolveLocale(locale), {
+    year: 'numeric',
+    month: '2-digit',
+    day: '2-digit',
+    hour: '2-digit',
+    minute: '2-digit',
+    second: '2-digit',
+  });
+}