feat(widgets): add phase 4 validation and accessibility

assets/admin/index.html

@@ -1,12 +0,0 @@
-<!DOCTYPE html>
-<html lang="zh-CN">
-<head>
-  <meta charset="UTF-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>AKSRT 主题设置</title>
-</head>
-<body>
-  <div id="aksrt-admin-app"></div>
-  <script type="module" src="/src/main.js"></script>
-</body>
-</html>