Revert "renamed client to src"

This reverts commit c28736bd01.

client/entry-client-admin.jsx

@@ -0,0 +1,12 @@
+import React from 'react'
+import { hydrateRoot } from 'react-dom/client';
+import Admin from './admin.jsx';
+
+import './admin/admin.less'
+
+window.start_app = (props) => {
+  hydrateRoot(
+    document.getElementById('reactRoot'),
+    <Admin {...props} />
+  )
+}