Add FS-YK device support and correct FTMS resistance/inclination encoding

[cagnulein]

Motivation

• Recognize and support FS-YK bikes which operate in resistance-level mode and do not support ERG, and ensure resistance commands are encoded the way each device expects.
• Ensure FTMS SET_INDOOR_BIKE_SIMULATION_PARAMS and SET_TARGET_RESISTANCE_LEVEL payloads use the correct unit scaling and little-endian packing so bikes interpret grade and resistance values correctly.

Description

• Add detection for FS-YK in deviceDiscovered and set FS_YK = true, resistance_lvl_mode = true, ergModeSupported = false, and max_resistance = 21.
• Include FS_YK in resistance handling logic so Resistance is initialized for single-byte devices and the multiplication-by-10 conversion is applied where required.
• Clarify and adjust forceResistance encoding paths and add a comment that some devices expect a 2-byte resistance value in 0.1 units (x10).
• Update forceInclination to convert inclination to FTMS format by multiplying by 100 (0.01% units) and pack the grade into bytes 3-4 as a little-endian sint16.

Testing

• Project compiled successfully after the changes using the standard build process.
• Existing automated unit/integration tests were executed and completed without failures.

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Codex Task

[cagnulein]

#3897

[stale]

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