Integrate frontend UI to request Web Push permission and show setting panel

Web/templates/notifications.html

@@ -14,6 +14,8 @@
     </form>
   </div>
 
+  <div id="push-notification-settings" style="margin-bottom: 24px;"></div>
+
   <div style="display:grid; grid-template-columns:1fr; gap:14px;">
     <section style="background:#fff; border:1px solid #e2e8f0; border-radius:14px; padding:16px;">
       <h2 style="margin:0 0 12px; font-size:1.15rem;">Meine Benachrichtigungen</h2>
@@ -83,4 +85,12 @@
     {% endif %}
   </div>
 </div>
+
+<script>
+document.addEventListener('DOMContentLoaded', function() {
+    if (typeof showPushNotificationSettings === 'function') {
+        showPushNotificationSettings();
+    }
+});
+</script>
 {% endblock %}