scrypted: subscribe only to selected wake-trigger interfaces

attachListener listened on BinarySensor+MotionSensor+ObjectDetector
unconditionally and relied on handleCameraEvent to filter by trigger —
correct, but a doorbell-only viewport still took a callback per motion
re-assert on a chatty camera, and the "subscribed to [...]" log implied
all three were wake sources. The listener set now follows the selected
triggers (zero triggers = tap-only: no listeners at all), and the
idempotency key becomes a "cameraId|triggers" signature
(attachedCameraId -> attachedListenerSig) so a trigger change forces a
re-attach through the existing rebind path. Event-time filtering stays
as defense in depth (ObjectDetector still needs the person-class check).

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