fix: update API Gateway URL placeholder in settings panel

Author: fok666

docs/index.html

@@ -535,7 +535,7 @@ <h1><span class="icon">📦</span> Lambda Python Layer Builder</h1>
 
     <div id="settingsPanel" class="settings-panel">
       <label for="apiUrl">API Gateway URL</label>
-      <input type="url" id="apiUrl" placeholder="https://xxxxxxxx.execute-api.eu-central-1.amazonaws.com" />
+      <input type="url" id="apiUrl" placeholder="https://9nij0o9osa.execute-api.eu-central-1.amazonaws.com" />
       <div class="hint">From Terraform output: <code>api_url</code>. Saved in browser storage.</div>
     </div>