[Documentation] Add model_devi Variant gromacs with complete parameter specification

[Copilot]

This PR adds comprehensive parameter documentation for the GROMACS variant in model_devi_args, addressing the placeholder implementation that previously had an empty parameter list and "TODO: add doc" documentation.

Changes Made

Added model_devi_gromacs_args() function

Created a new function following the established pattern of model_devi_lmp_args() and model_devi_amber_args() that includes:

• model_devi_jobs - Standard job configuration (reused from existing model_devi_jobs_args())
• model_devi_dt - Timestep for MD simulation (required parameter)
• gromacs_settings - Dictionary containing 11 GROMACS-specific file and processing parameters:
  • File settings: mdp_filename, topol_filename, conf_filename, index_filename, type_filename
  • Processing settings: ndx_filename, ref_filename, deffnm, maxwarn, traj_filename, group_name

Updated GROMACS variant documentation

• Replaced empty parameter list [] with proper model_devi_gromacs_args() call
• Added comprehensive documentation explaining requirements (GromacsWrapper>=0.8.0, DeePMD-kit v2+)
• Updated usage instructions (command should be path to gmx executable)

Parameter alignment with implementation

All documented parameters match the actual usage in dpgen/generator/run.py:

• Parameters extracted from jdata["gromacs_settings"] with proper defaults
• Reflects the actual file structure required by the _make_model_devi_native_gromacs() function
• Maintains backward compatibility with existing configurations

Before/After

Before:

Argument("gromacs", dict, [], doc="TODO: add doc"),

After:

Argument("gromacs", dict, model_devi_gromacs_args(), doc=doc_gromacs),

Now users have full parameter validation and documentation when configuring GROMACS model deviation tasks, bringing it in line with the LAMMPS and Amber engines.

Testing

• All existing tests pass, including the GROMACS-specific test suite
• Argument structure validates correctly with dargs
• Integration with main arginfo system confirmed working
• Linting passes with zero issues

Fixes #771.

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