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/pages/LoginPage.tsx

@@ -0,0 +1,65 @@
+import React, { useState } from 'react';
+import { useNavigate } from 'react-router-dom';
+import { login } from '../api';
+import { useAuth } from '../auth/AuthContext';
+import { PasswordInput } from '../components/PasswordInput';
+import bokBadge from '../assets/bok-removebg.png';
+
+export const LoginPage: React.FC = () => {
+  const [username, setUsername] = useState('');
+  const [password, setPassword] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [busy, setBusy] = useState(false);
+  const { refresh } = useAuth();
+  const navigate = useNavigate();
+
+  const onSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError(null);
+    setBusy(true);
+    try {
+      const user = await login({ username, password });
+      await refresh();
+      navigate(user.mustChangePassword ? '/change-password' : '/dashboard', { replace: true });
+    } catch (err) {
+      setError(err instanceof Error ? err.message : '로그인 실패');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <div className="center-screen">
+      <form className="card auth-card" onSubmit={onSubmit}>
+        <img src={bokBadge} className="auth-badge" alt="" />
+        <h1 className="auth-title">IT센터 출입자관리</h1>
+        <p className="auth-sub">시스템에 로그인하세요</p>
+
+        {error && <div className="alert alert-error">{error}</div>}
+
+        <label className="field">
+          <span>아이디</span>
+          <input
+            className="ime-en"
+            value={username}
+            onChange={(e) => setUsername(e.target.value)}
+            autoFocus
+            autoCapitalize="off"
+            autoCorrect="off"
+            spellCheck={false}
+          />
+        </label>
+        <label className="field">
+          <span>비밀번호</span>
+          <PasswordInput value={password} onChange={(e) => setPassword(e.target.value)} />
+        </label>
+
+        <button className="btn-primary full" type="submit" disabled={busy || !username || !password}>
+          {busy ? '로그인 중…' : '로그인'}
+        </button>
+
+        <p className="hint">초기 계정: admin / security / host (비밀번호 ChangeMe123!)</p>
+      </form>
+    </div>
+  );
+};