feat: 데모 URL 검증 페이지 추가

- DemoPage 컴포넌트: 토큰 검증 및 상태별 UI
- App.tsx: /d/:token 라우트 추가
- 활성/만료/철회/오류 상태 처리

src/App.tsx

@@ -1,12 +1,19 @@
 import { QueryClientProvider } from '@tanstack/react-query'
 import { ReactQueryDevtools } from '@tanstack/react-query-devtools'
-import { BrowserRouter } from 'react-router-dom'
+import { BrowserRouter, Routes, Route } from 'react-router-dom'
 import { queryClient } from '@/lib/query-client'
+import DemoPage from '@/pages/DemoPage'
 
 function App() {
   return (
     <QueryClientProvider client={queryClient}>
       <BrowserRouter>
+        <Routes>
+          {/* 데모 페이지 */}
+          <Route path="/d/:token" element={<DemoPage />} />
+
+          {/* 홈 페이지 */}
+          <Route path="/" element={
             <div className="min-h-screen bg-background">
               <div className="container mx-auto p-8">
                 <h1 className="text-4xl font-bold text-foreground mb-4">
@@ -24,10 +31,13 @@ function App() {
                     <li>Zustand for global state</li>
                     <li>Axios with interceptors</li>
                     <li>React Router for routing</li>
+                    <li>Demo System (/d/:token)</li>
                   </ul>
                 </div>
               </div>
             </div>
+          } />
+        </Routes>
       </BrowserRouter>
       <ReactQueryDevtools initialIsOpen={false} />
     </QueryClientProvider>

src/pages/DemoPage.tsx

@@ -0,0 +1,168 @@
+import { useEffect, useState } from 'react';
+import { useParams } from 'react-router-dom';
+import axios from 'axios';
+
+interface DemoResponse {
+  status: 'active' | 'expired' | 'revoked' | 'error';
+  message: string;
+  company?: string;
+  expires_at?: string;
+  visit_count?: number;
+  expired_at?: string;
+}
+
+export default function DemoPage() {
+  const { token } = useParams<{ token: string }>();
+  const [data, setData] = useState<DemoResponse | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    const fetchDemoData = async () => {
+      try {
+        const response = await axios.get(`http://admin.sam.kr/d/${token}`);
+        setData(response.data);
+      } catch (error: any) {
+        setData(error.response?.data || {
+          status: 'error',
+          message: '데모 링크를 확인할 수 없습니다.',
+        });
+      } finally {
+        setLoading(false);
+      }
+    };
+
+    if (token) {
+      fetchDemoData();
+    }
+  }, [token]);
+
+  if (loading) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-gray-50">
+        <div className="text-center">
+          <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-600 mx-auto"></div>
+          <p className="mt-4 text-gray-600">데모 링크 확인 중...</p>
+        </div>
+      </div>
+    );
+  }
+
+  if (!data) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-gray-50">
+        <div className="bg-white p-8 rounded-lg shadow-lg max-w-md">
+          <h1 className="text-2xl font-bold text-red-600 mb-4">오류</h1>
+          <p className="text-gray-700">데모 링크를 불러올 수 없습니다.</p>
+        </div>
+      </div>
+    );
+  }
+
+  // 활성 상태
+  if (data.status === 'active') {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-blue-50 to-indigo-100">
+        <div className="bg-white p-10 rounded-2xl shadow-2xl max-w-2xl w-full">
+          <div className="text-center">
+            <div className="bg-green-100 rounded-full w-20 h-20 flex items-center justify-center mx-auto mb-6">
+              <svg className="w-10 h-10 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
+              </svg>
+            </div>
+            <h1 className="text-4xl font-bold text-gray-900 mb-4">
+              {data.message}
+            </h1>
+            <div className="space-y-3 mt-8">
+              <div className="bg-blue-50 p-4 rounded-lg">
+                <p className="text-sm text-blue-600 font-medium">고객사</p>
+                <p className="text-xl font-semibold text-blue-900">{data.company}</p>
+              </div>
+              <div className="grid grid-cols-2 gap-4">
+                <div className="bg-gray-50 p-4 rounded-lg">
+                  <p className="text-xs text-gray-500">만료 일시</p>
+                  <p className="text-sm font-medium text-gray-900">{data.expires_at}</p>
+                </div>
+                <div className="bg-gray-50 p-4 rounded-lg">
+                  <p className="text-xs text-gray-500">방문 횟수</p>
+                  <p className="text-sm font-medium text-gray-900">{data.visit_count}회</p>
+                </div>
+              </div>
+            </div>
+            <div className="mt-10 p-6 bg-gradient-to-r from-blue-500 to-indigo-600 rounded-xl">
+              <h2 className="text-2xl font-bold text-white mb-2">SAM 데모 시스템</h2>
+              <p className="text-blue-100">
+                데모 콘텐츠가 여기에 표시됩니다.
+              </p>
+            </div>
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  // 만료/철회/에러 상태
+  const statusConfig = {
+    expired: {
+      title: '만료된 링크',
+      color: 'text-orange-600',
+      bgColor: 'bg-orange-100',
+      iconColor: 'text-orange-600',
+      icon: (
+        <svg className="w-10 h-10" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z" />
+        </svg>
+      ),
+    },
+    revoked: {
+      title: '철회된 링크',
+      color: 'text-red-600',
+      bgColor: 'bg-red-100',
+      iconColor: 'text-red-600',
+      icon: (
+        <svg className="w-10 h-10" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+        </svg>
+      ),
+    },
+    error: {
+      title: '오류',
+      color: 'text-gray-600',
+      bgColor: 'bg-gray-100',
+      iconColor: 'text-gray-600',
+      icon: (
+        <svg className="w-10 h-10" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
+        </svg>
+      ),
+    },
+  };
+
+  const config = statusConfig[data.status as keyof typeof statusConfig] || statusConfig.error;
+
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-gray-50">
+      <div className="bg-white p-10 rounded-2xl shadow-xl max-w-md w-full text-center">
+        <div className={`${config.bgColor} rounded-full w-20 h-20 flex items-center justify-center mx-auto mb-6`}>
+          <div className={config.iconColor}>
+            {config.icon}
+          </div>
+        </div>
+        <h1 className={`text-3xl font-bold ${config.color} mb-4`}>
+          {config.title}
+        </h1>
+        <p className="text-gray-700 text-lg mb-6">
+          {data.message}
+        </p>
+        {data.expired_at && (
+          <div className="bg-gray-50 p-4 rounded-lg">
+            <p className="text-xs text-gray-500">만료 일시</p>
+            <p className="text-sm font-medium text-gray-900">{data.expired_at}</p>
+          </div>
+        )}
+        <p className="mt-8 text-sm text-gray-500">
+          데모 링크가 필요하시면 담당자에게 문의하세요.
+        </p>
+      </div>
+    </div>
+  );
+}