add osu API

src/routes/api/osu/beatmap/[id]/+server.ts

@@ -0,0 +1,14 @@
+import { json, error } from '@sveltejs/kit';
+import { getBeatmap } from '$lib/server/osu/api';
+import type { RequestHandler } from './$types';
+
+export const GET: RequestHandler = async ({ params, locals }) => {
+	if (!locals.user) error(401, 'Not logged in');
+
+	try {
+		const beatmap = await getBeatmap(params.id);
+		return json(beatmap);
+	} catch {
+		error(404, 'Beatmap not found');
+	}
+};