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/models/repositories/relay.ts

@@ -1,5 +1,5 @@
 import { EntityRepository, Repository } from 'typeorm';
-import { Relay } from '../entities/relay';
+import { Relay } from '../entities/relay.js';
 
 @EntityRepository(Relay)
 export class RelayRepository extends Repository<Relay> {