refactor: Use ESM (#8358)

* wip

* wip

* fix

* clean up

* Update tsconfig.json

* Update activitypub.ts

* wip

packages/backend/src/models/schema/federation-instance.ts

@@ -1,4 +1,4 @@
-import config from "@/config";
+import config from '@/config/index.js';
 
 export const packedFederationInstanceSchema = {
 	type: 'object',

packages/backend/src/models/schema/notification.ts

@@ -1,4 +1,4 @@
-import { notificationTypes } from "@/types";
+import { notificationTypes } from '@/types.js';
 
 export const packedNotificationSchema = {
 	type: 'object',