docs: annotate payment, host operations and shared components

app/components/PageSteps.vue

@@ -1,4 +1,5 @@
 <script>
+/** 只读步骤条：steps 为文案数组，current 从 1 开始；小于当前步骤的项显示完成标记。 */
 import "~/assets/styles/PageSteps.B5K7G9zF.css";
 import { toDisplayString } from "vue";
 import { renderList } from "vue";