初始化项目：基础设施 + 用户认证 + 后台管理系统 + AGPL 3.0 许可

templates/MetaLab-2026/html/layout/nav.html

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+<header>
+    <div class="container nav-container">
+        <a href="/" class="logo">Meta<span>Lab</span></a>
+        <button class="mobile-menu-btn" id="mobileMenuBtn">
+            <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round"><line x1="3" y1="6" x2="21" y2="6"/><line x1="3" y1="12" x2="21" y2="12"/><line x1="3" y1="18" x2="21" y2="18"/></svg>
+        </button>
+        <ul class="nav-links" id="navLinks">
+            <li><a href="/">首页</a></li>
+            {{if .IsLoggedIn}}
+            <li><a href="/settings" class="nav-user">{{.Username}}</a></li>
+            <li><a href="javascript:void(0)" class="nav-logout" id="logoutBtn">退出</a></li>
+            {{else}}
+            <li><a href="/auth/login" class="nav-login">登录</a></li>
+            {{end}}
+        </ul>
+    </div>
+</header>