fix: scale FTMS speed commands for Horizon T202

[cagnulein]

Summary

• Detects JFTM T202* Horizon treadmill devices.
• Converts the FTMS target-speed command from km/h to mph for this model family.
• Keeps the workaround scoped to the T202 and leaves other Horizon/FTMS treadmill paths unchanged.

Background

mail Horizon t202 on 9/8/2026

The supplied debug log showed the treadmill interpreting FTMS speed commands with an approximately 1.609 scaling factor:

• QZ requested 1.0, the treadmill reported approximately 1.6.
• QZ requested 1.4, the treadmill reported approximately 2.2.
• A decrease command could therefore make the treadmill speed increase.

The log also showed that the FTMS path was active (JFTM T202-5_4DEE, FTMS service 0x1826, Control Point 0x2AD9, and horizon_treadmill_force_ftms=true).

Implementation

The T202 is identified from the BLE name prefix and the target speed is converted with the existing 0.621371 miles conversion before encoding FTMS_SET_TARGET_SPEED.

Test plan

• git diff --check
• Build QZ library with qmake/make (build/)
• Verify the diff is limited to horizontreadmill.cpp and horizontreadmill.h
• Validate on a physical Horizon/JFTM T202 with + and -