When pulse-sensor-proxy is available, the setup script now automatically
detects and uses the proxy's SSH public key instead of trying to generate
keys inside the container.
This fixes temperature monitoring setup for Docker deployments where:
- Container has proxy socket mounted at /mnt/pulse-proxy
- Proxy handles SSH connections to nodes
- Setup script needs to distribute the proxy's key, not container's key
The fix queries /api/system/proxy-public-key during setup script generation
and overrides SSH_SENSORS_PUBLIC_KEY if the proxy is available.
Tested with Docker on native Proxmox host (delly) - temperatures collected
successfully via proxy socket.
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