Update of FIT digitizer parameters for 2025 data

[spulawsk]

This PR updates FT0 and FV0 digitizer settings for Run 3 data (runs 562260–568721) to better reflect 2025 conditions and recent digitizer improvements.

Key changes
FT0 calibration: set to ~14 ADC/MIP (mMip_in_V = 7, updated conversion factors)
System-dependent tuning:

Pb–Pb: DCS-consistent FT0 thresholds and FV0 charge settings adapted to high multiplicity
pp / OO / NeNe: DCS-consistent FT0 thresholds and FV0 charge levels for low-multiplicity systems
FV0 ADC/MIP:
pp: 15
light systems (OO, NeNe, pO): 11

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