chore: 初始化仓库

中华文明全图鉴——文物全图系统（PC Web 地图 + NestJS API + 管理后台）。
含三大 IP（文物南迁北归 / 国宝海外回归 / 博物馆手艺人）、AI 文物对话、
文物地图与详情、以及 demo-video-kit 演示视频生成工具。

apps/admin/src/store/auth.ts

@@ -0,0 +1,47 @@
+import { useState, useEffect } from "react";
+
+export interface AuthUser {
+  id: string;
+  username: string;
+  nickname: string;
+  role: string;
+}
+
+const USER_KEY = "admin_user";
+const TOKEN_KEY = "access_token";
+
+export function saveAuth(token: string, user: AuthUser) {
+  localStorage.setItem(TOKEN_KEY, token);
+  localStorage.setItem(USER_KEY, JSON.stringify(user));
+}
+
+export function clearAuth() {
+  localStorage.removeItem(TOKEN_KEY);
+  localStorage.removeItem(USER_KEY);
+}
+
+export function getStoredUser(): AuthUser | null {
+  try {
+    const s = localStorage.getItem(USER_KEY);
+    return s ? (JSON.parse(s) as AuthUser) : null;
+  } catch {
+    return null;
+  }
+}
+
+export function useAuth() {
+  const [user, setUser] = useState<AuthUser | null>(getStoredUser);
+
+  useEffect(() => {
+    const handler = () => setUser(getStoredUser());
+    window.addEventListener("storage", handler);
+    return () => window.removeEventListener("storage", handler);
+  }, []);
+
+  const logout = () => {
+    clearAuth();
+    setUser(null);
+  };
+
+  return { user, setUser, logout };
+}