Add /admin redirect page for automatic routing

- Navigating to /admin redirects to /admin/dashboard if authenticated
- AdminLayoutClient handles auth check and redirects to /admin/login if not authenticated
- Shows loading spinner during redirect
- Provides clean entry point to admin portal

app/admin/page.tsx

@@ -0,0 +1,24 @@
+'use client';
+
+import { useEffect } from 'react';
+import { useRouter } from 'next/navigation';
+import { Loader2 } from 'lucide-react';
+
+export default function AdminIndex() {
+  const router = useRouter();
+
+  useEffect(() => {
+    // Redirect to dashboard
+    // The AdminLayoutClient will handle auth check and redirect to login if needed
+    router.push('/admin/dashboard');
+  }, [router]);
+
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-sail-white">
+      <div className="text-center">
+        <Loader2 className="w-8 h-8 text-deep-sea-blue animate-spin mx-auto mb-4" />
+        <p className="text-deep-sea-blue/70 font-medium">Redirecting to admin portal...</p>
+      </div>
+    </div>
+  );
+}