reolink(nvr): ONVIF push-based motion for Home Hub battery cameras

[SnoElement]

Fixes #2072.

Problem

Battery/solar cameras behind a Reolink Home Hub (Pro) sleep to save power. While asleep, the hub answers the GetMdState/GetAiState polling the NVR client relies on with "device offline", so motion never reaches Scrypted/HomeKit and HomeKit Secure Video never records. The hub does, however, push these events over ONVIF PullPoint.

Change

Adds an opt-in ONVIF push path for hub channels:

• onvif-api.ts: extract the source-channel token from each event (<tt:Source> SimpleItem VideoSourceConfigurationToken/Source/VideoSourceToken), interpret the topic into a motion flag + optional object class, and emit a separate channel-aware onvifChannelEvent (motion, class, channel). The existing onvifEvent / event / data emissions are left unchanged, so this is purely additive and existing consumers are unaffected.
• nvr.ts: open one hub-level PullPoint subscription and route each event by channel to the matching camera, mapping Reolink rule topics (People/Vehicle/DogCat/Face/Package + CellMotion/MotionAlarm) to motion and an optional ObjectDetector class. Raw event XML is logged only when Debug Events is enabled.
• camera.ts: a "Use ONVIF for Object Detection" control that registers the channel, plus a debounced triggerOnvifMotion() that sets motionDetected and fires the ObjectDetector event (gated on the camera's advertised classes).

Validation

We made these changes to get the plugin working on our own setup — a Reolink Home Hub Pro with sleeping battery cameras — and have confirmed success in day-to-day use. Person/vehicle/motion events now arrive over the push subscription and trigger HomeKit recordings where polling returned "device offline".

Notes

• Related: Reolink nvr #1947, Reolink Doorbell not Sending Notifications via Scrypted #1642.
• Known limitation (documented in code as a follow-up): there is no plugin-level liveness watchdog yet — if the onvif library's pull loop wedges on a non-retryable error, the subscription isn't auto-restarted. Acceptable for the initial opt-in; flagged for a follow-up before relying on it as the sole motion source for sleeping cameras.

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