Debug: Notification config save/toggle logging

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

server/src/plugins/notifications/index.ts

@@ -224,6 +224,7 @@ const notificationsPlugin: Plugin = {
 
     // Save config
     app.post('/api/notifications/config', requireAdmin, (req, res) => {
+      console.log(`${NB} Save request body:`, JSON.stringify(req.body));
       const { channels } = req.body ?? {};
       if (!Array.isArray(channels)) { res.status(400).json({ error: 'channels array erforderlich' }); return; }
       // Validate each channel config