Refactor repository to match fz-Model template

[Copilot]

Restructures the repository to align with the fz-Model template for consistency across Funz plugins.

Structure changes

• samples/ → examples/ with model-specific subdirectories (Cristal-SnKeff/, Cristal-SnNormes/, Cristal-Pij-MC/, CRISTAL-AP2M5/)
• example_usage.py → example_usage.ipynb (Jupyter notebook)
• Localhost_Cristal.json → localhost_Cristal.json (lowercase convention)

New files

• LICENSE (BSD 3-Clause)
• tests/test_plugin.py - validates model files, calculator configs, scripts, and example files
• .github/workflows/ci.yml - JSON validation, shell syntax check, fzi parsing test

Updated

• README.md - restructured to match template format, updated paths
• .gitignore - aligned with template

fz-cristal/
├── examples/
│   ├── Cristal-SnKeff/godiva1d.snk
│   ├── Cristal-SnNormes/godiva1d.snn
│   ├── Cristal-Pij-MC/godiva.mor
│   └── CRISTAL-AP2M5/godiva_model.xml
├── .fz/{models,calculators}/
├── tests/test_plugin.py
└── .github/workflows/ci.yml

Original prompt

refactor repository to match template fz-Model

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