Support DDC/CI over the display cable (I²C) in addition to USB HID.
This requires implementing a back-end for ddcci transport and selecting it dynamically.
Acceptance Criteria:
- New back-end for DDC/CI transport.
- Automatic detection between USB HID and DDC/CI.
- At least one vendor verified working via DDC/CI.
Support DDC/CI over the display cable (I²C) in addition to USB HID.
This requires implementing a back-end for ddcci transport and selecting it dynamically.
Acceptance Criteria: