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/remote/activitypub/misc/get-note-html.ts

@@ -1,6 +1,6 @@
 import * as mfm from 'mfm-js';
-import { Note } from '../../../models/entities/note';
-import { toHtml } from '../../../mfm/to-html';
+import { Note } from '@/models/entities/note.js';
+import { toHtml } from '../../../mfm/to-html.js';
 
 export default function(note: Note) {
 	let html = note.text ? toHtml(mfm.parse(note.text), JSON.parse(note.mentionedRemoteUsers)) : null;

src/remote/activitypub/misc/html-to-mfm.ts

@@ -1,6 +1,6 @@
-import { IObject } from '../type';
-import { extractApHashtagObjects } from '../models/tag';
-import { fromHtml } from '../../../mfm/from-html';
+import { IObject } from '../type.js';
+import { extractApHashtagObjects } from '../models/tag.js';
+import { fromHtml } from '../../../mfm/from-html.js';
 
 export function htmlToMfm(html: string, tag?: IObject | IObject[]) {
 	const hashtagNames = extractApHashtagObjects(tag).map(x => x.name).filter((x): x is string => x != null);

src/remote/activitypub/misc/ld-signature.ts

@@ -1,8 +1,8 @@
 import * as crypto from 'crypto';
 import * as jsonld from 'jsonld';
-import { CONTEXTS } from './contexts';
+import { CONTEXTS } from './contexts.js';
 import fetch from 'node-fetch';
-import { httpAgent, httpsAgent } from '@/misc/fetch';
+import { httpAgent, httpsAgent } from '@/misc/fetch.js';
 
 // RsaSignature2017 based from https://github.com/transmute-industries/RsaSignature2017