refactor(frontend): boot分割したり副作用減らしたりとか

#10838

packages/frontend/src/boot/sub-boot.ts

@@ -0,0 +1,8 @@
+import { computed, createApp, watch, markRaw, version as vueVersion, defineAsyncComponent } from 'vue';
+import { common } from './common';
+
+export async function subBoot() {
+	const { isClientUpdated } = await common(() => createApp(
+		defineAsyncComponent(() => import('@/ui/minimum.vue')),
+	));
+}