[Feature Request] Camera snapshots (async_camera_image) return no data

[phoenix-server]

Is your feature request related to a problem? Please describe.
A camera entity from this integration cannot produce a still-image snapshot. The live stream works, because it uses the WebRTC path (async_handle_async_webrtc_offer). A snapshot request uses a different path (async_camera_image), and that method returns None:

async def async_camera_image(
    self, width: int | None = None, height: int | None = None
) -> bytes | None:
    """Return bytes of camera image.
    Currently not implemented"""
    return None

Home Assistant treats a None result as a failure. Any caller of the snapshot endpoint gets an HTTP 500 error, with no exception in the log. This affects the picture-glance card, the camera.snapshot service, and any automation or notification that needs a still image.

Describe the solution you'd like
Add snapshot support to WyzeCamera.async_camera_image. One option: take a single frame from the WebRTC session, since the integration already opens one for live view. Another option: if a Wyze cloud endpoint returns a still image for the affected camera models, call that endpoint instead.

Describe alternatives you've considered
No workaround exists yet. The supported_features value for this entity is CameraEntityFeature.STREAM only. Home Assistant's usual ffmpeg-based frame-grab fallback needs a stream_source, and this entity does not set one, so that fallback does not apply either.

Additional context

• Confirmed against v0.1.39 (latest release), custom_components/wyzeapi/camera.py.
• Reproduced on four devices: three of model WYZE_CAKP2JFUS (Cam v3 hardware) and one of model HL_PAN3 (Pan Cam v3).
• Debug logs (custom_components.wyzeapi: debug, wyzeapy: debug) show the Wyze cloud session works during a snapshot request. Normal get_property_list and get_event_list calls succeed. No call for a still image appears, and no error is logged.

[cameri]

I'll take a stab at this and open a PR if I can get it to work.