Fix English homepage routing

Add dedicated route for /en to display home page in English using Kirby's multilingual system.

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

site/config/config.php

@@ -25,6 +25,18 @@ return [
                 );
             }
         ],
+        // English homepage
+        [
+            'pattern' => 'en',
+            'action' => function() {
+                $home = page('home');
+                if ($home) {
+                    site()->visit($home, 'en');
+                    return $home;
+                }
+                return null;
+            }
+        ],
         // French products (default)
         [
             'pattern' => '(:any)',