ref(global) update project structure

frontend/components/ConstructionPlaceHolder.tsx

@@ -0,0 +1,13 @@
+import React from 'react';
+
+const ConstructionPlaceHolder = () => {
+    return (
+        <div className={ `flex h-full w-full justify-center items-center` }>
+            <p className={ `text-2xl font-bold` }>
+                正在施工中...
+            </p>
+        </div>
+    );
+};
+
+export default ConstructionPlaceHolder;