T412 scattering equation bug fix

[jgroehl]

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Fixes #412

[Copilot]

Pull Request Overview

This PR fixes a critical bug in the Rayleigh scattering equation (issue #412) where an exponent was incorrectly specified as 1e-4 instead of -4. The fix is accompanied by comprehensive test coverage and related improvements to device parameters, documentation, and code quality.

• Main fix: Corrected Rayleigh scattering exponent from 1e-4 to -4 in scattering_from_rayleigh_and_mie_theory
• Added comprehensive test suite to prevent regression of the scattering equation bug
• Updated literature values and device parameters to match corrected scattering model

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated no comments.

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File	Description
simpa/utils/libraries/spectrum_library.py	Critical bug fix: Corrected Rayleigh scattering exponent from 1e-4 to -4
simpa_tests/automatic_tests/tissue_library/test_scattering_equation.py	Added comprehensive test coverage for scattering equation to prevent regression
simpa/utils/calculate.py	Fixed rotation_matrix_between_vectors to properly handle parallel and anti-parallel vectors
simpa/utils/libraries/literature_values.py	Updated BMIE coefficients for epidermis and dermis to align with corrected scattering model
simpa_tests/test_utils/tissue_composition_tests.py	Adjusted reference scattering value and improved test infrastructure with matplotlib backend
simpa/core/simulation_modules/optical_module/optical_adapter_base.py	Enhanced laser pulse energy handling to support wavelength-dependent energy values
simpa/core/simulation_modules/reconstruction_module/*.py	Added indexing='ij' parameter to torch.meshgrid calls for PyTorch 2.0+ compatibility
simpa/utils/settings.py	Added get() method for dictionary-like default value handling
simpa/utils/tags.py	Clarified documentation for LASER_PULSE_ENERGY_IN_MILLIJOULE to indicate iterable support
simpa/core/device_digital_twins/pa_devices/ithera_msot_acuity.py	Updated bandwidth (55% → 153%) and corrected laser position calculation for device accuracy
simpa/core/simulation_modules/acoustic_module/simulate_2D.m	Fixed comment: "minimum CFL" → "maximum CFL"
simpa/core/processing_components/monospectral/field_of_view_cropping.py	Corrected docstring to accurately describe field of view cropping functionality
simpa_tests/automatic_tests/tissue_library/test_tissue_library_against_literature_values.py	Removed temporary workaround for Intel architectures

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[jgroehl]

All literature values are quite hand-wavy within SIMPA to be fully honest.
I have arrived at a middle ground between the values reported by Jacques and the ones reported by Bashkatov et al.
I believe that the updated values are now more consistent than before and still well within the Variability of values reported in the literature.

[TomTomRixRix]

Looks good to me. I'm not an expert on the tissue parameters, but the implementation makes sense.

[TomTomRixRix]

Was the intel architectures issue solved or do we simply not care anymore?