fix: ensure home page data is serializable

Fixed serialization error by converting Directus SDK response objects to
plain JSON using JSON.parse(JSON.stringify()).

This resolves the error:
'Data returned from load while rendering / is not serializable:
Cannot stringify arbitrary non-POJOs (data.models)'

Also improved performance by using Promise.all to fetch models and videos
in parallel instead of sequentially.

packages/frontend/src/routes/+page.server.ts

@@ -1,7 +1,13 @@
 import { getFeaturedModels, getFeaturedVideos } from "$lib/services";
 export async function load({ fetch }) {
+	const [models, videos] = await Promise.all([
+		getFeaturedModels(3, fetch),
+		getFeaturedVideos(3, fetch),
+	]);
+
+	// Ensure data is serializable by converting to plain JSON
 	return {
-		models: await getFeaturedModels(3, fetch),
-		videos: await getFeaturedVideos(3, fetch),
+		models: JSON.parse(JSON.stringify(models)),
+		videos: JSON.parse(JSON.stringify(videos)),
 	};
 }