Device gains disabledReason (cleared automatically on re-enable). The
devices admin page prompts for a reason when disabling, and shows it
under the device's status once disabled.
New public GET /api/devices/:serial/status lets a field device check
whether it's disabled and why, before any user session exists —
unauthenticated by design, matching the existing serial-based trust
model used for devices/<serial>/log ingestion, and only ever reveals
a boolean plus a short reason string.
The devices/<serial>/log ingest path didn't check isActive at all
(the devices/<mqttUsername>/points path already did) — closed that
gap for both "log" and "status" message types so a disabled device's
data is rejected regardless of which path it arrives on.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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