feat: add sitemap (#61)

Author: Najeong-Kim

src/app/sitemap.ts

@@ -0,0 +1,27 @@
+import type { MetadataRoute } from 'next';
+
+import { ResortData } from '@/entities/resort';
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || 'https://www.weski.live';
+
+  // 메인 페이지
+  const mainPage: MetadataRoute.Sitemap = [
+    {
+      url: baseUrl,
+      lastModified: new Date(),
+      changeFrequency: 'daily',
+      priority: 1,
+    },
+  ];
+
+  // 리조트 상세 페이지들 - ResortData에서 동적으로 생성
+  const resortPages: MetadataRoute.Sitemap = ResortData.map((resort) => ({
+    url: `${baseUrl}/${resort.id}`,
+    lastModified: new Date(),
+    changeFrequency: 'daily',
+    priority: 0.8,
+  }));
+
+  return [...mainPage, ...resortPages];
+}