fix: use /vncproxy endpoint with websocket:0 parameter

The /vncproxy endpoint requires websocket: 0 (not -1) in the POST body.
Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

@@ -3,6 +3,7 @@
 
 PROXMOX_API_URL=http://proxmox.lan:8006/api2/json
 PROXMOX_WEB_URL=http://proxmox.lan:8006
+PROXMOX_CONSOLE_TOKEN=root@pam!monitorapp
 PROXMOX_TOKEN_ID=root@pam!monitorapp
 PROXMOX_TOKEN_SECRET=<your-token-secret>
 API_POLL_INTERVAL=30000