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.

scripts/generate-sitemap.ts

@@ -0,0 +1,36 @@
+// scripts/generate-sitemap.ts
+const fs = require('fs');
+const path = require('path');
+const http = require('http');
+require('dotenv').config();
+
+const API_PATH = '/api/sitemapBuilder';
+const DEST_PATH = path.join(process.cwd(), 'public', 'sitemap.xml');
+
+function fetchSitemap(): Promise<string> {
+  return new Promise((resolve, reject) => {
+    http
+      .get(
+        `${process.env.VERCEL_PROJECT_PRODUCTION_URL}${API_PATH}`,
+        (res: any) => {
+          let data = '';
+
+          res.on('data', (chunk: any) => (data += chunk));
+          res.on('end', () => resolve(data));
+        },
+      )
+      .on('error', reject);
+  });
+}
+
+(async () => {
+  try {
+    const xml = await fetchSitemap();
+
+    fs.writeFileSync(DEST_PATH, xml, 'utf8');
+    console.log('✅ Sitemap generated at public/sitemap.xml');
+  } catch (err) {
+    console.error('❌ Failed to generate sitemap:', err);
+    process.exit(1);
+  }
+})();