Reporter Kyobinoyo asked for the equivalent of the existing
print-finish auto-off but triggered when AMS drying ends.
Two new SmartPlug columns: auto_off_after_drying (default false),
off_delay_after_drying_minutes (default 10 — AMS chamber is hot
post-cycle so longer cooldown than the print-finish default of 5).
SQLite + Postgres migrations both idempotent.
Trigger lives in BambuMQTTClient — per-AMS _previous_dry_times
tracks the dry_time > 0 → 0 falling edge and fires a new
on_drying_complete(ams_id) callback. Plumbed through
PrinterManager.set_drying_complete_callback to
SmartPlugManager.on_drying_complete(printer_id, db), which walks
linked plugs and respects the per-plug toggle. Catches queue,
ambient and manual drying identically because it observes firmware
state, not scheduler intent.
Frontend: single "Auto Off After Drying" toggle + delay input on
the smart plug card, next to the existing print-finish auto-off
section.
Per-AMS plug routing (separate plug for AMS only, per-AMS targeting
on dual-AMS printers) deferred — Bambuddy's plug model is
plug→printer, so the trigger fires whenever any AMS on the linked
printer finishes a cycle.