feat:move auth demo to main

src/routes/+page.server.ts

@@ -0,0 +1,12 @@
+import { redirect } from '@sveltejs/kit';
+import type { PageServerLoad } from './$types';
+
+export const load: PageServerLoad = async (event) => {
+	if (!event.locals.user) {
+		return redirect(302, '/login');
+	}
+
+	return {
+		user: event.locals.user
+	};
+};