chore: use native pyproject config for tox and pytest

[nandgator]

Summary

• Replace legacy_tox_ini with native [tool.tox] tables (tox>=4.22), keeping the same environments: lint, type, format, sast and py311 to py314. The type and unit-test envs install the crypto-eth-addresses extra through extras.
• Replace [tool.pytest.ini_options] with the native [tool.pytest] table (needs pytest 9.0 or later).
• Raise the dev dependency floors to match (tox>=4.22, pytest>=9.0.3), then relock with pdm and re-export package/requirements.*.txt. No pin was downgraded; only packaging and pluggy moved, both forward.
• Other tool configs (ruff, pyright, bandit, setuptools) were already native.

Test plan

• tox -e py311,py312,py313,py314,type,lint,sast all pass (1029 tests per interpreter including doctests)
• export man and export web build with no warnings and no diffs to committed docs; the man page renders
• CI

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