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

src/routes/(token-based)/+layout.server.ts

@@ -0,0 +1,10 @@
+import { type ServerLoadEvent } from '@sveltejs/kit';
+import type { PageServerLoad } from '../anmeldung/$types';
+
+export const load: PageServerLoad = (event: ServerLoadEvent) => {
+	if (event.locals.user) {
+		return {
+			user: event.locals.user
+		};
+	}
+};