Add sitemap and portfolio category SEO routes

lib/portfolio.ts

@@ -266,6 +266,17 @@ export async function getActivePortfolioCategories() {
   return categories.map(mapCategory);
 }
 
+export async function getActivePortfolioCategoryBySlug(slug: string) {
+  const category = await prisma.category.findFirst({
+    where: {
+      slug,
+      isActive: true,
+    },
+  });
+
+  return category ? mapCategory(category) : null;
+}
+
 export async function getAdminPortfolioProjects(filters?: {
   categoryId?: string;
   status?: "all" | "draft" | "published";