refactor login page, change routes to token-based, add service classes

src/routes/(angemeldet)/+layout.server.ts

@@ -1,5 +1,5 @@
 import { redirect, type ServerLoadEvent } from '@sveltejs/kit';
-import type { PageServerLoad } from './view/[vorgang]/[tatort]/$types';
+import type { PageServerLoad } from '../anmeldung/$types';
 
 export const load: PageServerLoad = (event: ServerLoadEvent) => {
 	if (!event.locals.user && event.url.pathname !== '/anmeldung') throw redirect(303, '/anmeldung');