feat: update product categories data structure and implement sitemap generation

- Refactored product categories to use a new data structure.
- Updated API routes to fetch product categories from the new data source.
- Implemented sitemap generation script using dotenv for environment variables.
- Added sitemap generation endpoint to the API.
- Removed old sitemap file and replaced it with a dynamically generated one.

src/app/api/sitemapBuilder/route.ts

@@ -0,0 +1,55 @@
+'use server';
+
+// app/(api)/sitemap/route.ts
+import { NextResponse } from 'next/server';
+import { productCategoriesData } from '../product_categories/data';
+
+const HOST = 'http://localhost:3000';
+
+const pages = [
+  '/',
+  '/about-us',
+  '/contact-us',
+  '/blog',
+  '/product-categories',
+  '/projects',
+];
+
+const locales = ['en', 'fa'];
+
+export async function GET() {
+  try {
+    pages.push(
+      ...productCategoriesData.map(
+        (productCategory) => `/product-categories/${productCategory.id}`,
+      ),
+    );
+
+    const urls = pages.flatMap((page) =>
+      locales.map((locale) => {
+        const loc = `/${locale}`;
+        return `
+          <url>
+            <loc>${HOST}${loc}${page}</loc>
+            <changefreq>weekly</changefreq>
+            <priority>0.8</priority>
+          </url>
+        `;
+      }),
+    );
+
+    const xml = `<?xml version="1.0" encoding="UTF-8"?>
+      <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+        ${urls.join('\n')}
+      </urlset>`;
+
+    return new NextResponse(xml, {
+      headers: {
+        'Content-Type': 'application/xml',
+      },
+    });
+  } catch (err) {
+    console.error('Sitemap generation failed:', err);
+    return new NextResponse('Internal Server Errorsssssss', { status: 500 });
+  }
+}