Implements automatic temperature monitoring setup for standalone
Proxmox/Pimox nodes without manual SSH key configuration.
Changes:
- Add /api/system/proxy-public-key endpoint to expose proxy's SSH public key
- Setup script now detects standalone nodes (non-cluster)
- Auto-fetches and installs proxy SSH key with forced commands
- Add Raspberry Pi temperature support via cpu_thermal and /sys/class/thermal
- Enhance setup script with better error handling for lm-sensors installation
- Add RPi detection to skip lm-sensors and use native thermal interface
Security:
- Public key endpoint is safe (public keys are meant to be public)
- All installed keys use forced command="sensors -j" with full restrictions
- No shell access, port forwarding, or other SSH features enabled
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