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/api/endpoints/app/create.ts

@@ -1,9 +1,9 @@
 import $ from 'cafy';
-import define from '../../define';
-import { Apps } from '../../../../models';
-import { genId } from '@/misc/gen-id';
-import { unique } from '../../../../prelude/array';
-import { secureRndstr } from '@/misc/secure-rndstr';
+import define from '../../define.js';
+import { Apps } from '@/models/index.js';
+import { genId } from '@/misc/gen-id.js';
+import { unique } from '../../../../prelude/array.js';
+import { secureRndstr } from '@/misc/secure-rndstr.js';
 
 export const meta = {
 	tags: ['app'],