goldenChat base source add

frontend/src/utils/adminUnlock.ts

@@ -0,0 +1,16 @@
+/** 관리자 설정 화면 잠금 해제 (세션, 30분) */
+const KEY = 'gc_admin_unlock_until';
+const TTL_MS = 30 * 60 * 1000;
+
+export function isAdminUnlocked(): boolean {
+  const until = Number(sessionStorage.getItem(KEY) ?? 0);
+  return Number.isFinite(until) && until > Date.now();
+}
+
+export function setAdminUnlocked(): void {
+  sessionStorage.setItem(KEY, String(Date.now() + TTL_MS));
+}
+
+export function clearAdminUnlock(): void {
+  sessionStorage.removeItem(KEY);
+}