Related to #738
Fixes two issues discovered by k5madsen:
1. Missing jq dependency: The sensor wrapper script uses jq extensively to
parse SMART data JSON from smartctl but the installer never checked if
jq was installed. Added jq to REQUIRED_CMDS list.
2. Secondary node support: When running on a secondary Proxmox cluster node
where the container doesn't exist locally, the script now:
- Warns instead of failing with "Container does not exist"
- Continues installation for host temperature monitoring
- Skips container-specific socket mount configuration
This allows users to run the installer on all cluster nodes (as intended)
to ensure the sensor-proxy service is available when containers migrate.
rcourtman
ee9c63c880