v4.0.0: 회원·덱 API, 인증 UI, 프로필 및 레이아웃 통일

Express/SQLite API와 Docker 구성을 추가하고 로그인·덱 저장·공개 덱·관리자·프로필 화면을 구현했다. 결과 화면 저장 UX, 헤더 프로필, 애드센스용 app-shell 레이아웃(1280px) 및 문서를 반영했다.

Co-authored-by: Cursor <cursoragent@cursor.com>

login.html

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+<!doctype html>
+<html lang="ko">
+    <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <link rel="stylesheet" href="./style/output.css" />
+        <link rel="stylesheet" href="./style/auth-pages.css" />
+        <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Noto+Sans+KR:wght@400;700&display=swap" rel="stylesheet" />
+        <title>로그인 - UADECK</title>
+    </head>
+    <body class="auth-page">
+        <nav class="auth-nav">
+            <div class="auth-nav-inner">
+                <a href="/" class="auth-brand">
+                    <img src="/images/assets/apple-touch-icon.png" alt="UA Logo" />
+                    <span class="auth-brand-text">UADECK <span>v4.0.0</span></span>
+                </a>
+            </div>
+        </nav>
+
+        <main class="auth-main">
+            <header class="auth-header">
+                <h1>로그인</h1>
+                <p>덱을 저장하고 관리하려면<br />계정으로 로그인하세요.</p>
+            </header>
+
+            <form id="login-form" class="auth-card">
+                <div class="auth-field">
+                    <label class="auth-label" for="email">이메일</label>
+                    <input type="email" id="email" required class="auth-input" placeholder="you@example.com" autocomplete="email" />
+                </div>
+                <div class="auth-field">
+                    <label class="auth-label" for="password">비밀번호</label>
+                    <input type="password" id="password" required class="auth-input" placeholder="••••••••" autocomplete="current-password" />
+                </div>
+                <p id="error-msg" class="auth-error hidden"></p>
+                <button type="submit" class="auth-submit">로그인</button>
+            </form>
+
+            <p class="auth-footer">
+                계정이 없으신가요?
+                <a href="/signup.html">회원가입</a>
+            </p>
+        </main>
+
+        <script src="/script/api.js"></script>
+        <script>
+            document.getElementById('login-form').addEventListener('submit', async (e) => {
+                e.preventDefault();
+                const errEl = document.getElementById('error-msg');
+                errEl.classList.add('hidden');
+                try {
+                    const email = document.getElementById('email').value;
+                    const password = document.getElementById('password').value;
+                    const { token, user } = await UaDeckApi.login(email, password);
+                    UaDeckApi.saveAuth(token, user);
+                    const redirect = new URLSearchParams(location.search).get('redirect') || '/';
+                    location.href = redirect;
+                } catch (err) {
+                    errEl.textContent = err.message;
+                    errEl.classList.remove('hidden');
+                }
+            });
+        </script>
+    </body>
+</html>