fix: correct images field to be array in recipe creation

The images field was incorrectly set as a single object instead of an array,
causing translation to fail with 'images.forEach is not a function' error.
Also added defensive Array.isArray check in translation service.

src/routes/[recipeLang=recipeLang]/add/+page.svelte

@@ -108,7 +108,7 @@
 		return {
 			...card_data,
 			...add_info,
-			images: {mediapath: short_name.trim() + '.webp', alt: "", caption: ""},
+			images: [{mediapath: short_name.trim() + '.webp', alt: "", caption: ""}],
 			season: season_local,
 			short_name : short_name.trim(),
 			portions: portions_local,