feat(auth): pre-fill login credentials for admin user

client/src/pages/login.tsx

@@ -11,8 +11,8 @@ import { Lock, User, Sparkles } from "lucide-react";
 export default function Login() {
   const [, setLocation] = useLocation();
   const { toast } = useToast();
-  const [username, setUsername] = useState("");
+  const [username, setUsername] = useState("admin");
-  const [password, setPassword] = useState("");
+  const [password, setPassword] = useState("admin");
   const [isLoading, setIsLoading] = useState(false);
   const [showDefaultPassword, setShowDefaultPassword] = useState(false);