OpenRing: support payload-based commands and enable PPG waveform streaming

[TobiasRoeddiger]

Motivation

• The open ring PPG command (0x32) requires a multi-byte payload to enable continuous waveform streaming instead of a single sub-opcode.
• Existing OpenRing configuration used a single subOpcode byte which cannot express the required PPG payload parameters.
• Add payload support to configuration and command framing so PPG streaming and other multi-byte commands can be sent correctly.

Description

• Replaced the single subOpcode with a List<int> payload in OpenRingSensorConfigurationValue and updated the configuration wiring to pass the payload when applying a configuration (file: lib/src/models/capabilities/sensor_configuration_specializations/open_ring_sensor_configuration.dart).
• Updated OpenRingSensorConfig to carry a List<int> payload and changed toBytes() to serialize commands as the framed packet [0x00, <seq>, <cmd>, ...payload] (file: lib/src/managers/open_ring_sensor_handler.dart).
• Updated the OpenRing device factory to provide payload-formatted values for IMU on/off and implemented the PPG on/off payloads required for waveform streaming; the PPG "On" payload sends 00 <seq> 32 00 00 19 01 01 semantics and the "Off" payload sends the corresponding stop payload (file: lib/src/models/devices/open_ring_factory.dart).

Testing

• Ran a code search rg -n "OpenRingSensorConfig\(|OpenRingSensorConfigurationValue\(" lib/src -S to confirm usages were updated and this check succeeded.
• Ran git diff --check and static checks with no reported issues.
• Attempted to run dart format / flutter format for automatic formatting but those tools were not available in the environment, so formatting checks were not executed.

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Codex Task

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