init: basic structure

src/layouts/404.vue

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+<script setup lang="ts">
+const router = useRouter()
+</script>
+
+<template>
+  <main p="x4 y10" text="center green-700 dark:gray-200">
+    <div text-4xl>
+      <div i-ri-error-warning-line inline-block />
+    </div>
+    <RouterView />
+    <div>
+      <button btn text-sm m="3 t8" @click="router.back()">
+        返回
+      </button>
+    </div>
+  </main>
+</template>

src/layouts/README.md

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+## Layouts
+
+Vue components in this dir are used as layouts.
+
+By default, `default.vue` will be used unless an alternative is specified in the route meta.
+
+With [`vite-plugin-pages`](https://github.com/hannoeru/vite-plugin-pages) and [`vite-plugin-vue-layouts`](https://github.com/JohnCampionJr/vite-plugin-vue-layouts), you can specify the layout in the page's SFCs like this:
+
+```html
+<route lang="yaml">
+meta:
+  layout: home
+</route>
+```

src/layouts/default.vue

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+<template>
+  <main class="px-4 text-center text-gray-700 dark:text-gray-200">
+    <Menu />
+    <RouterView />
+    <BaseFooter />
+  </main>
+</template>