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/entities/note-unread.ts

@@ -1,8 +1,8 @@
 import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
-import { User } from './user';
-import { Note } from './note';
-import { id } from '../id';
-import { Channel } from './channel';
+import { User } from './user.js';
+import { Note } from './note.js';
+import { id } from '../id.js';
+import { Channel } from './channel.js';
 
 @Entity()
 @Index(['userId', 'noteId'], { unique: true })