OIDC 인증 라우트 및 로그인/콜백 페이지 구현

devfront/src/features/auth/AuthGuard.tsx

@@ -0,0 +1,20 @@
+import { useAuth } from "react-oidc-context";
+import { Navigate, Outlet } from "react-router-dom";
+
+export default function AuthGuard() {
+  const auth = useAuth();
+
+  if (auth.isLoading) {
+    return <div>Loading...</div>;
+  }
+
+  if (auth.error) {
+    return <div>Auth Error: {auth.error.message}</div>;
+  }
+
+  if (!auth.isAuthenticated) {
+    return <Navigate to="/login" replace />;
+  }
+
+  return <Outlet />;
+}