gtag 추가

frontend/src/views/payment/PaymentFail.vue

@@ -16,13 +16,21 @@
 
 <script setup>
 import { ref, onMounted } from 'vue';
+import { useGtag } from 'vue-gtag-next';
 import { useRouter, useRoute } from 'vue-router';
 
 const router = useRouter();
 const route = useRoute();
 const message = ref('');
 
+// 페이지 진입 시 Google Analytics 페이지뷰 추적
 onMounted(async () => {
+  const gtag = useGtag();
+  gtag.pageview({
+    page_title: '결제실패',
+    page_path: window.location.pathname,
+    page_location: window.location.href
+  });
   // URL에서 메시지 가져오기
   message.value = route.query.message || '결제가 취소되었습니다.';