- Agent: neuer 'proxmox_action' Command (start/stop/shutdown fuer VMs und LXC)
- Backend: POST /api/v1/agents/{id}/proxmox/action Endpoint
- Frontend: Start/Stop/Shutdown Buttons in VMs- und Container-Tab
- Play (gruen) = starten (nur wenn gestoppt)
- Power (gelb) = Graceful Shutdown (nur VMs, nur wenn running)
- Stop (rot) = Hard Stop (wenn running)
- api/client.js: proxmoxAction() Methode