refactor(iframe-page): remove unused lifecycle hooks and clean up script setup

src/views/_builtin/iframe-page/[url].vue

@@ -1,19 +1,9 @@
 <script setup lang="ts">
-import { onActivated, onMounted } from 'vue';
-
 interface Props {
   url: string;
 }
 
 defineProps<Props>();
-
-onMounted(() => {
-  console.log('mounted');
-});
-
-onActivated(() => {
-  console.log('activated');
-});
 </script>
 
 <template>