Fix API key to match production intra.cuitunet.fi

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

index.html

@@ -312,7 +312,7 @@ document.querySelector('.nav-toggle')?.addEventListener('click', function() {
 // Pikasaatavuustarkistus
 (function() {
     const API_URL = 'https://intra.cuitunet.fi/api.php';
-    const API_KEY = '3de64ed2a3ece1c0f497345e41e8e76d';
+    const API_KEY = '560160bf6558260e1734e6ad5933cabe';
     const checkInput = document.getElementById('check-address');
     const checkBtn = document.getElementById('check-btn');
     const checkResult = document.getElementById('check-result');