add vitepress docs

docs/demos/notify-view/basic.vue

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+<template>
+	<div class="demo">
+		<notify-view :detail="detail" />
+	</div>
+</template>
+
+<script lang="ts" setup>
+import { NotifyView } from "timi-tdesign-mobile";
+import type { NotifyDetail } from "timi-tdesign-mobile";
+
+/** NotifyView 只关心正文相关字段，主题与状态由业务页面自行呈现。 */
+const detail: NotifyDetail = {
+	subject: "系统维护通知",
+	contentType: "TIP_TAP",
+	content: `<h2>系统维护通知</h2>
+<p>本周六 02:00 - 04:00 进行数据库升级，期间服务不可用。</p>
+<ul><li>请提前保存工作内容</li><li>升级完成后会同步通知</li></ul>`
+};
+</script>