Add a login verification code

Fix the site icon

web/template/admin/layout.html

@@ -4,6 +4,9 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width" />
     <title>{{ .Title }} - {{ .SystemName }}</title>
+    <!-- 站点图标 -->
+    <link rel="icon" type="image/svg+xml" href="/assets/favicon.svg" />
+    <link rel="shortcut icon" href="/favicon.ico" />
     <link rel="stylesheet" href="/static/css/admin.css" />
     <script type="module" src="./static/lib/include.js"></script>
   </head>