refactor: refactoring imports

将来ESMに移行しやすいように
Related: #7658

なんかmochaが起動しなくなってるけど理由不明
すぐ直したい

src/server/web/manifest.ts

@@ -1,6 +1,6 @@
 import * as Koa from 'koa';
 import * as manifest from './manifest.json';
-import { fetchMeta } from '@/misc/fetch-meta';
+import { fetchMeta } from '@/misc/fetch-meta.js';
 
 module.exports = async (ctx: Koa.Context) => {
 	const json = JSON.parse(JSON.stringify(manifest));