Improve Socket.IO logging and connection handling

- Enhanced logging during WebSocket upgrade attempts by including specific headers for better debugging.
- Updated frontend socket service to allow forced upgrade attempts after successful polling connections, improving connection reliability.

frontend/src/services/socketService.js

@@ -85,14 +85,16 @@ export const connectSocket = (clubId) => {
       reconnectionDelayMax: 5000,
       reconnectionAttempts: Infinity, // Unbegrenzte Versuche
       timeout: 20000,
-      upgrade: true,
+      upgrade: true, // Erlaube Upgrade von Polling zu WebSocket
       forceNew: false,
       secure: isHttps, // Nur für HTTPS
       rejectUnauthorized: false, // Für selbst-signierte Zertifikate (nur Entwicklung)
       // Verbesserte Cookie-Handling
       withCredentials: true,
       // Auto-Connect
-      autoConnect: true
+      autoConnect: true,
+      // Erzwinge Upgrade-Versuch nach erfolgreicher Polling-Verbindung
+      rememberUpgrade: true
     });
 
     socket.on('connect', () => {