Fix import statements

Remove unused or unneeded imports and change imports of luxon APIs to
use the wrapper.

server/api/auth/account.delete.ts

@@ -1,7 +1,7 @@
 import {
 	readUsers, readSessions, readSubscriptions,
 	writeUsers, writeSessions, writeSubscriptions,
- } from "~/server/database";
+} from "~/server/database";
 import { broadcastEvent, cancelAccountStreams } from "~/server/streams";
 
 export default defineEventHandler(async (event) => {