fix: add force-static export to sitemap for static build compatibility

- Add 'export const dynamic = "force-static"' to sitemap.ts
- Fixes Next.js static export build error when using output: export
- Resolves make build-serve failing due to missing static export configuration

Author: root

src/app/sitemap.ts

@@ -0,0 +1,18 @@
+import type { MetadataRoute } from 'next';
+
+export const dynamic = 'force-static';
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  const baseUrl = 'https://helpdev.com.br';
+  const now = new Date();
+
+  const routes = ['/', '/services', '/about', '/articles', '/projects', '/blog', '/thanks'];
+
+  return routes.map((route) => ({
+    url: `${baseUrl}${route}`,
+    lastModified: now,
+    changeFrequency: 'weekly',
+    priority: route === '/' ? 1 : 0.8,
+  }));
+}
+