fix(web): link "Bize Ulaşın" custom-needs button to the contact page

The custom-integration / bulk-query CTA was a dead button. Wrap it in a
Link to /contact.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/src/routes/index.tsx

@@ -1325,13 +1325,15 @@ export function HomePage() {
                     Özel entegrasyon veya toplu sorgulama ihtiyacınız varsa bize ulaşın.
                   </p>
                 </div>
-                <Button
-                  variant="outline"
-                  className="mt-4 rounded-full border-border text-muted-foreground hover:bg-muted hover:text-foreground"
-                >
-                  Bize Ulaşın
-                  <ChevronRight className="ml-1 size-4" />
-                </Button>
+                <Link to="/contact" className="mt-4">
+                  <Button
+                    variant="outline"
+                    className="rounded-full border-border text-muted-foreground hover:bg-muted hover:text-foreground"
+                  >
+                    Bize Ulaşın
+                    <ChevronRight className="ml-1 size-4" />
+                  </Button>
+                </Link>
               </div>
             </div>
           </div>