refactor: 合并多语言支持的显示名称字段，优化奖池手动爆发功能的返回数据结构，增强管理端权限控制

src/lib/admin-datetime.ts

@@ -23,6 +23,35 @@ function formatParts(date: Date, timeZone?: string): string {
   return `${year}-${month}-${day} ${hour}:${minute}:${second}`;
 }
 
+const WEEKDAY_KEYS = [
+  "sunday",
+  "monday",
+  "tuesday",
+  "wednesday",
+  "thursday",
+  "friday",
+  "saturday",
+] as const;
+
+export type AdminWeekdayKey = (typeof WEEKDAY_KEYS)[number];
+
+export function adminWeekdayKeyForDate(date: Date = new Date()): AdminWeekdayKey {
+  return WEEKDAY_KEYS[date.getDay()] ?? "sunday";
+}
+
+/**
+ * 仪表盘顶栏日期：数字日期 + i18n 星期（避免 Intl 在 ne 等语言下回退到系统中文）。
+ */
+export function formatAdminCalendarToday(locale: AdminApiLocale, weekdayLabel: string): string {
+  const d = new Date();
+  const y = d.getFullYear();
+  const m = String(d.getMonth() + 1).padStart(2, "0");
+  const day = String(d.getDate()).padStart(2, "0");
+  const datePart = locale === "en" ? `${m}/${day}/${y}` : `${y}-${m}-${day}`;
+
+  return `${datePart} ${weekdayLabel}`;
+}
+
 /**
  * 将接口返回的 ISO 时间串格式化为浏览器本地时区下的 `YYYY-MM-DD HH:mm:ss`。
  */