docs: annotate funds, backups and loading states

app/components/instance/InstanceMonitorSkeleton.vue

@@ -1,4 +1,5 @@
 <script>
+// 监控加载占位按模块展示一张 DCIM 图或四张云监控图，不触发任何监控请求。
 import "~/assets/styles/InstanceMonitorSkeleton.C0FT51jJ.css";
 import { renderList } from "vue";
 import { normalizeClass } from "vue";