Initial commit: IT센터 출입자관리시스템 (ACS)

방문자 사전신청·승인, 입·출입 체크인/아웃, QR 배지, 재실현황,
블랙리스트, 대시보드 통계, 방문 리포트(엑셀)까지 7단계 전 기능 구현.

- backend: Spring Boot 3.4.5 / Java 21 (JDK 26 빌드), 세션 인증, JPA, H2/PostgreSQL, POI, ZXing, Flyway
- frontend: React 19 / Vite 6 / TypeScript
- infra: Docker Compose (db·app·web nginx), Flyway V1__init, Python 사용자 시드
- docs: 워크플로우 / 시퀀스 다이어그램(Mermaid) / 이슈·유의사항

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/auth/AuthContext.tsx

@@ -0,0 +1,54 @@
+import React, { createContext, useCallback, useContext, useEffect, useState } from 'react';
+import { getCurrentUser } from '../api';
+import { CurrentUser, Role } from '../types';
+
+interface AuthState {
+  user: CurrentUser | null;
+  loading: boolean;
+  refresh: () => Promise<void>;
+  clear: () => void;
+  hasRole: (...roles: Role[]) => boolean;
+}
+
+const AuthContext = createContext<AuthState | undefined>(undefined);
+
+export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
+  const [user, setUser] = useState<CurrentUser | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  const refresh = useCallback(async () => {
+    setLoading(true);
+    try {
+      setUser(await getCurrentUser());
+    } catch {
+      setUser(null);
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  const clear = useCallback(() => setUser(null), []);
+
+  const hasRole = useCallback(
+    (...roles: Role[]) => !!user && roles.some((r) => user.roles.includes(r)),
+    [user],
+  );
+
+  useEffect(() => {
+    void refresh();
+  }, [refresh]);
+
+  return (
+    <AuthContext.Provider value={{ user, loading, refresh, clear, hasRole }}>
+      {children}
+    </AuthContext.Provider>
+  );
+};
+
+export function useAuth(): AuthState {
+  const ctx = useContext(AuthContext);
+  if (!ctx) {
+    throw new Error('useAuth must be used within AuthProvider');
+  }
+  return ctx;
+}