Replace struphy format/lint with plain ruff

[max-models]

Summary

struphy lint only enforced ruff format, ruff's import sorting (ruff check --select I) and a check for # $ OpenMP pragmas. struphy format only ran those two ruff commands in a loop. This PR drops both commands and uses ruff directly.

Changes

• Removed struphy format and struphy lint. This deletes src/struphy/console/format.py (~1550 lines) and its test.
• Removed the OpenMP # $ check. pyccel now accepts a space after # in OpenMP pragmas.
• struphy build-init-files moved to src/struphy/console/build_init_files.py. It still regenerates models/, propagators/ and geometry/domains/ __init__.py, then sorts imports and formats them with ruff. Its --linters, --iterations and -y options are removed. The package folders are now found relative to the installed package rather than the current working directory.
• Import sorting is done by ruff (extend-select = ["I"] in pyproject.toml), replacing isort.
• Dev extra: removed autopep8, isort, flake8, pylint, ssort, add-trailing-comma and tabulate, and added ruff==0.15.0. Also removed the [tool.autopep8], [tool.isort] and [tool.pylint] config sections and the [flake8] section in setup.cfg.
• CI:
  • GitHub: removed the struphy_lint_all and isort jobs. The ruff job now runs ruff format --check and ruff check; until now ruff format --check was commented out.
  • GitLab: the four struphy lint jobs are replaced by one ruff job.
  • Neither job needs a struphy install anymore.
• One-time formatting: struphy lint only covered src/, so I ran ruff check --fix and ruff format on tutorials/, doc/, utils/ and profiling/. That's 25 files, all automatic fixes.
• Docs: the developer's guide has a new section on formatting and import sorting, plus a section on struphy build-init-files.

How to format now

ruff check --fix   # lint + sort imports
ruff format        # format

Testing

• ruff format --check and ruff check pass on the whole repo.
• struphy build-init-files reproduces the committed __init__.py files exactly.
• The console tests test_state.py and test_params_profile.py pass.

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