TUI-compatible Hamlib rotctld TCP server that works with the
existing SerialBridge/DemoDevice interface. F2 Control's Track
tab now starts/stops a real TCP server on the configured port.
Status callbacks report connection state, move count, and command
rate back to the TrackingPanel via thread-safe call_from_thread.
Includes 7 pilot tests exercising the full protocol path through
asyncio TCP clients against the DemoDevice.
