Slim legacy modules and demote notebooks to supplementary material

[ShengrenHOU]

Summary

• split the legacy algorithm utility module into focused config, replay, torch, and evaluation helpers
• clean up the pyomo benchmark and data augmentation modules so they are import-safe and easier to reuse
• make scripts the maintained workflow and clearly demote notebooks to supplementary material

Validation

• py -3 examples\quickstart_env.py
• py -3 examples\custom_env_config.py
• py -3 examples\topology_scenarios.py
• py -3 examples\training_smoke.py
• py -3 -m pytest tests -q
• py -3 -m ruff check .
• py -3 -m build
• py -3 -m sphinx -E -a -b html docs docs\_build\html