feat: add Hydrow serial rower support

[cagnulein]

Summary

• Add first Hydrow rower integration based on the serial protocol discovered in the Hydrow APK.
• Use the Hydrow setting only as an enable trigger; the entered value is not treated as a device path.
• Automatically probe /dev/ttyMT1, /dev/ttyUSB0, and /dev/ttyACM0 on Android/Linux, with COM1–COM3 fallback on Windows.
• Send the initial Cm 0 handshake and parse diagnostic/metric records including Di, Di2, Ds2, and Rl.
• Add full TX/RX qDebug output for refinement with real Hydrow logs.

Test plan

• git diff --check
• python3 -m json.tool src/settings-catalog.json
• Qt/qmake library build: make -f Makefile.qdomyos-zwift-lib -j2
• qmllint src/settings.qml
• Validate against a physical Gen 1 Hydrow and refine protocol details from captured logs.

[cagnulein]

https://github.com/cagnulein/qdomyos-zwift/actions/runs/31031266084

you can use the android build in the link (check at the bottom of the page in about 1 hour).