Add offset_list and scat_scale support to multi-band/multi-image fitting setup

[Copilot]

This PR extends ProFuse fitting setup wrappers to better support cross-image alignment and likelihood scatter scaling, while preserving existing behavior when new options are not used.

Changes Made

• Added offset_list support to profuseMultiBandFound2Fit:
  • normalizes and validates input (NULL, length-1 recycle, or per-band list matching image_list)
  • validates each non-NULL offset element as numeric [X, Y]
  • forwards per-band offsets into profitSetupData(offset=...)
• Updated multi-band documentation (man/profuseMultiBand.Rd) to include offset_list usage and constraints.
• Updated vignette wording to reflect that multi-band workflows now support per-band offsets.
• Reviewed and corrected new scat_scale integration against ProFit profitLikeModel expectations:
  • fixed multi-band bounds logic to check MF2F$parm.names (instead of an undefined Data reference)
• Added analogous scat_scale support to multi-image workflow:
  • new scat_scale argument in profuseMultiImageFound2Fit
  • appends log_scat_scale to parameter names when enabled
  • adds [-2, 2] bounds for log_scat_scale in profuseMultiImageDoFit
  • includes guard logic for safe bounds checks
• Added scat_scale documentation to:
  • man/profuseMultiBand.Rd
  • man/profuseMultiImage.Rd

Notes on Validation

• Automated code review/validation was run and resulting issues were addressed.
• Local R-based test/check execution was not possible in this environment because R is unavailable.

[asgr]

@copilot check the new scat_scale implementation (especially check how it interacts with asgr/ProFit profitLikeModel, which has scat_scale added already). Add relevant documentation, and add similar support in profuseMultiImage.

[Copilot]

@copilot check the new scat_scale implementation (especially check how it interacts with asgr/ProFit profitLikeModel, which has scat_scale added already). Add relevant documentation, and add similar s...

Implemented in commits bd7b296 and ec7dda5.

• Checked/fixed scat_scale multi-band wiring against ProFit profitLikeModel: the bounds check now correctly uses MF2F$parm.names (fixing the undefined Data reference).
• Added analogous scat_scale support in profuseMultiImageFound2Fit/profuseMultiImageDoFit (including bounds handling for log_scat_scale).
• Added relevant documentation for scat_scale in man/profuseMultiBand.Rd and man/profuseMultiImage.Rd.