refactor: Use ESM (#8358)

* wip

* wip

* fix

* clean up

* Update tsconfig.json

* Update activitypub.ts

* wip

packages/backend/src/misc/is-instance-muted.ts

@@ -1,4 +1,4 @@
-import { Packed } from "./schema";
+import { Packed } from './schema.js';
 
 export function isInstanceMuted(note: Packed<'Note'>, mutedInstances: Set<string>): boolean {
 	if (mutedInstances.has(note?.user?.host ?? '')) return true;