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

#10838

packages/frontend/src/_boot_.ts

@@ -0,0 +1,12 @@
+// https://vitejs.dev/config/build-options.html#build-modulepreload
+import 'vite/modulepreload-polyfill';
+
+import '@/style.scss';
+import { mainBoot } from './boot/main-boot';
+import { subBoot } from './boot/sub-boot';
+
+if (['/share', '/auth', '/miauth'].includes(location.pathname)) {
+	subBoot();
+} else {
+	mainBoot();
+}