auto-claude: subtask-2-4 - Verify PageSpeed scores and fix SEO issues

- Created PAGESPEED_VERIFICATION_REPORT.md with comprehensive audit results
- Fixed robots.txt conflict by removing static public/robots.txt
- Updated src/app/robots.ts to include language-specific sitemaps (de, en, sr)
- Local Lighthouse tests: Accessibility 92-100%, Best Practices 100%
- Performance/SEO verification requires manual testing via pagespeed.web.dev
- Added .auto-claude/ to .gitignore

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/robots.ts

@@ -12,6 +12,11 @@ export default function robots(): MetadataRoute.Robots {
         crawlDelay: 1,
       },
     ],
-    sitemap: `${baseUrl}/sitemap.xml`,
+    sitemap: [
+      `${baseUrl}/sitemap.xml`,
+      `${baseUrl}/sitemap-de.xml`,
+      `${baseUrl}/sitemap-en.xml`,
+      `${baseUrl}/sitemap-sr.xml`,
+    ],
   };
 }