Rebuild the SMART device list on every refresh instead of keeping
per-device type and parser state across rescans. Each device gets a
short ordered list of smartctl queries, and the three parsers are merged
into one that rejects output without health data so the next query runs.
- scsi devices try auto-detect, then -d sat (#2295)
- NVMe controllers fall back to their n1 namespace
- disks in standby reuse their last reading; a disk not yet collected
is woken once per agent run
- the last good reading survives temporary read failures
- failed or empty rescans keep the previous device list
- a missing SMART status is UNKNOWN instead of FAILED
- the reported disk type is the type that worked (e.g. sat)
- disks seen through two paths are reported once
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Co-authored-by: hank <hank@henrygd.me>
