added admin dashboard

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

@@ -0,0 +1,14 @@
+import type { LayoutServerLoad } from './$types';
+import { listSubmissions } from '$lib/server/submissions';
+import { unreadCount } from '$lib/server/notifications';
+
+export const load: LayoutServerLoad = ({ locals, url }) => {
+  const submissionsCount = locals.admin ? listSubmissions().length : 0;
+  const unreadNotifications = locals.admin ? unreadCount() : 0;
+  return {
+    admin: locals.admin,
+    pathname: url.pathname,
+    submissionsCount,
+    unreadNotifications
+  };
+};