add admin logout

src/routes/admin/logout/+server.ts

@@ -0,0 +1,16 @@
+import type { RequestHandler } from '@sveltejs/kit';
+import { deleteSession, getSession } from '$lib/server/session';
+import { Permissions } from '$lib/permissions';
+
+export const POST = (async ({ cookies }) => {
+	if (getSession(cookies, [Permissions.AdminWrite]) == null) {
+		return new Response(null, {
+			status: 401
+		});
+	}
+
+	deleteSession(cookies);
+	cookies.delete('session');
+
+	return new Response();
+}) satisfies RequestHandler;