docs: annotate payment, host operations and shared components

app/components/ProductCategoryNotice.vue

@@ -1,4 +1,5 @@
 <script>
+/** 分类订购说明：兼容被 HTML 实体编码的文本，清理富文本后仅在存在可见内容时展示。 */
 import "~/assets/styles/ProductCategoryNotice.CwaR3eXN.css";
 import { normalizeClass } from "vue";
 import { createCommentVNode } from "vue";
@@ -28,6 +29,7 @@ var u = {
         setup(o) {
           let c = o,
             f = computed(() => {
+              // 最多解码两轮纯文本包装，随后统一消毒；图片也算有效内容，空白占位不显示。
               let e = typeof c.description == `string` ? c.description : ``;
               for (let t = 0; t < 2; t++) {
                 let t = new DOMParser().parseFromString(e, `text/html`);