feature: add test md

pages/md.vue

+<template>
+    <MdRenderer :content="mdContent" />
+</template>
+<script setup>
+const mdContent = ref('');
+const { data } = await useFetch('https://ieditor-ai.inscode.cc/ai/md', { method: 'post' });
+mdContent.value = data.value.content;
+</script>
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