feat(slider): add slider feature

frontend/admin/src/main.js

@@ -1,14 +1,20 @@
 import './assets/main.css'
-
 import { createApp } from 'vue'
 import { createPinia } from 'pinia'
-
 import App from './App.vue'
 import router from './router'
 
-const app = createApp(App)
+function onReady(fn) {
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', fn);
+  } else {
+    fn();
+  }
+}
 
-app.use(createPinia())
-app.use(router)
-
-app.mount('#app')
+onReady(() => {
+  const app = createApp(App);
+  app.use(createPinia());
+  app.use(router);
+  app.mount('#app');
+});