feat: add untranslated recipes page for recipe admins

Add new page at /rezepte/untranslated for recipe admins to view and manage recipes without approved English translations. Includes translation status tracking, statistics dashboard, and visual badges.

Changes:
- Add API endpoint to fetch recipes without approved translations
- Create untranslated recipes page with auth checks for rezepte_users group
- Add translation status badges to Card component (pending, needs_update, none)
- Add database index on translations.en.translationStatus for performance
- Create layout for /rezepte route with header navigation
- Add "Unübersetzt" link to navigation for authorized users

src/routes/rezepte/+layout.server.ts

@@ -0,0 +1,9 @@
+import type { LayoutServerLoad } from './$types';
+
+export const load: LayoutServerLoad = async ({ locals }) => {
+	const session = await locals.auth();
+
+	return {
+		session
+	};
+};