[ALICE 3] Changed chip size and module number for TRK barrel + updated TRK documentation + included low services around beam pipe

[scannito]

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[Copilot]

Pull request overview

Updates the ALICE 3 TRK barrel geometry parameters and services modeling, aligning the simulated tracker layout (chip/module dimensions and counts) with the latest design, and expanding user-facing documentation for custom geometry configuration.

Changes:

• Update MLOT barrel configuration defaults (layer lengths and number of modules per stave) and refine config-file parsing readability.
• Add an optional “low services around the beam pipe” geometry for the Peacock services layout, controlled via a new TRKBase.includeLowServices configurable.
• Update TRK documentation with detailed custom geometry configuration file format and examples; update chip length in specs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx	Adds optional low services volumes around the beam pipe for Peacock services layout.
Detectors/Upgrades/ALICE3/TRK/simulation/src/Detector.cxx	Updates default cylindrical lengths and segmented module counts; improves config-file parsing clarity.
Detectors/Upgrades/ALICE3/TRK/simulation/include/TRKSimulation/TRKServices.h	Declares the new beam-pipe low-services builder method.
Detectors/Upgrades/ALICE3/TRK/README.md	Adds detailed documentation for custom geometry configuration files and examples.
Detectors/Upgrades/ALICE3/TRK/base/include/TRKBase/TRKBaseParam.h	Introduces includeLowServices configurable and modernizes irisOpen type to bool.
Detectors/Upgrades/ALICE3/TRK/base/include/TRKBase/Specs.h	Updates chip length constant (module MLOT chip length).

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