refactor: reorganize feature modules with consistent naming conventions and flattened structure

src/features/admin/AdminPage.client.js

@@ -0,0 +1,11 @@
+'use client';
+
+/**
+ * Admin Pages Export for Next.js App Router
+ * 
+ * This exports the admin client components.
+ * Users must create their own server component wrapper that uses protectAdmin.
+ */
+
+export { default as AdminPagesClient } from './components/AdminPages.js';
+export { default as AdminPagesLayout } from './components/AdminPagesLayout.js';