Use config.json instead of files in postprocessing

[max-models]

Solves the following issue(s):

Closes #293

Core changes:

Instead of exporting all the classes as pickled binary objects, export the main information about the simulation as a json file called config.json

[Copilot]

Pull request overview

This PR switches the simulation metadata persistence/ingestion path from multiple pickle “*.bin” artifacts to a single config.json, and updates post-processing to reconstruct simulation configuration from that JSON when no parameters.py is present.

Changes:

• Stop writing multiple pickled config artifacts (*.bin) and instead write a config.json based on Simulation.to_dict().
• Update post-processing parameter import logic to load EnvironmentOptions, Time, Domain, FluidEquilibrium, TensorProductGrid, DerhamOptions, and StruphyModel from config.json.
• Remove direct dependence on struphy.geometry.domains / struphy.fields_background.equils for reconstructing domain/equilibrium in post-processing.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/struphy/simulation/sim.py	Replace pickled config output with JSON config serialization to config.json.
src/struphy/post_processing/post_processing_tools.py	Replace “*.bin” config loading with config.json loading and object reconstruction via from_dict.

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