docs: annotate funds, backups and loading states

app/components/instance/InstanceLoadingShell.vue

@@ -1,4 +1,5 @@
 <script>
+// 实例详情加载占位：保持页签与卡片布局，用 aria-busy 告知辅助技术正在加载。
 import "~/assets/styles/InstanceLoadingShell.CwfiUwdU.css";
 import { renderList } from "vue";
 import { normalizeClass } from "vue";