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/misc/fetch.ts

@@ -3,7 +3,7 @@ import * as https from 'https';
 import CacheableLookup from 'cacheable-lookup';
 import fetch, { HeadersInit } from 'node-fetch';
 import { HttpProxyAgent, HttpsProxyAgent } from 'hpagent';
-import config from '@/config';
+import config from '@/config/index.js';
 import { URL } from 'url';
 
 export async function getJson(url: string, accept = 'application/json, */*', timeout = 10000, headers?: HeadersInit) {