Add ads.txt route for ad verification

- Introduced a new route for serving ads.txt, providing necessary information for ad verification by Google.
- This addition enhances compliance with advertising standards and improves the site's ad management capabilities.

client/public/ads.txt

@@ -0,0 +1 @@
+google.com, pub-1104166651501135, DIRECT, f08c47fec0942fa0

server/routes-seo.js

@@ -531,6 +531,11 @@ Sitemap: ${SITE_URL}/sitemap.xml
     res.send(robotsTxt);
   });
 
+  app.get('/ads.txt', (req, res) => {
+    res.type('text/plain');
+    res.send('google.com, pub-1104166651501135, DIRECT, f08c47fec0942fa0\n');
+  });
+
   app.get('/sitemap.xml', (req, res) => {
     try {
       const sitemap = buildSitemapXml();