Fix of the notification subscription

Web/static/js/push-notifications.js

@@ -25,7 +25,7 @@ class PushNotificationManager {
      * Initialize push notification system
      * Must be called after page load
      */
-    async init() {
+    async init(providedKey = null) {
         if (!this.isSupported) {
             console.log('Push notifications not supported in this browser');
             return false;
@@ -49,11 +49,18 @@ class PushNotificationManager {
                 }
             }
 
-            // Fetch VAPID public key from server
+            // Wenn der Key direkt aus dem Template übergeben wurde, nutze diesen (spart einen Request)
+            if (providedKey) {
+                this.vapidKey = providedKey;
+                return true;
+            }
+
+            // Ansonsten: Fetch VAPID public key from server
             const keyResponse = await fetch('/api/push/vapid-key');
             if (keyResponse.ok) {
                 const keyData = await keyResponse.json();
-                this.vapidKey = keyData.vapid_key;
+                // WICHTIG: Muss exakt mit dem Python-JSON-Key übereinstimmen!
+                this.vapidKey = keyData.publicKey;
             } else {
                 console.warn('Failed to fetch VAPID key');
                 return false;