feat: modernize packaging with uv, pyproject.toml and semantic-release

[farhan]

Important

PR implemented with the assistance of Claude Code. Refined and validated before being submitted for code review.

Modernize i18n-tools
Part of openedx/public-engineering#506

Summary

• edx-i18n-tools publishes to PyPI: https://pypi.org/project/edx-i18n-tools/
• Move the package into a src/ layout (src/i18n/)
• Replace setup.py/setup.cfg with pyproject.toml (PEP 621 static metadata)
• Switch from pip-compile to uv with PEP 735 dependency groups; commit uv.lock
• Retain pylint (edx-lint) and pycodestyle as on master
• Coverage config moved into pyproject.toml
• Update CI to use astral-sh/setup-uv, uv sync --group ci, and uv run tox; all actions SHA-pinned
• Add python-semantic-release + release.yml (OIDC trusted publishing), replacing the legacy pypi-publish.yml

Removed/Updated

Deleted files: setup.py, setup.cfg, .coveragerc, requirements/

Removed workflows: pypi-publish.yml (replaced by release.yml with OIDC publishing), upgrade-python-requirements.yml (depended on the deleted requirements/ + pip-compile toolchain; dependency upgrades are now handled by make upgrade via uv lock --upgrade)

Removed Makefile targets:

Target	Reason
piptools	Installed pip-tools; the pip-compile toolchain is replaced by uv
common_constraints.txt	Fetched/patched the pip-compile common-constraints file; constraints now live in [tool.edx_lint].uv_constraints

Updated Makefile targets:

Target	Change
upgrade	Now runs edx_lint write_uv_constraints + uv lock --upgrade instead of pip-compile
requirements	Now runs uv sync --group dev instead of pip-sync
test-python	Runs uv run pytest directly
quality-python	Runs uv run pycodestyle/uv run pylint directly against src/i18n (was tox -e quality)

Versioning

setuptools-scm with dynamic = ["version"] — the repo publishes to PyPI and python-semantic-release controls the version string at release time via git tags. Current version 2.0.0 is 1.x+, so no zero-version guard is set.

Important Notes

• Conventional commit format is now enforced on all future PRs to this repo via commitlint.yml (already present on master).
• No docs tox environment was added: the repo has no docs infrastructure (no docs/ directory, no Sphinx config, no make docs target) on master, so there is nothing to build.
• The pycodestyle ignore = E501,E731 config lived in the deleted setup.cfg; it was migrated to a [pycodestyle] section in tox.ini (pycodestyle does not read pyproject.toml).
• CI toxenv names (quality, django42, django52) and the block-form matrix lists are kept in exact parity with master; the Codecov upload still runs on django42.

Testing Notes

This PR has not been manually tested against the repo's own features. Testing relied on CI checks and local agent tooling (make requirements, make quality, make test, python -m build). Repo-owner is encouraged to run the repo's feature tests before merging.

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🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.78%. Comparing base (483d671) to head (ca5aaad).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #288   +/-   ##
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  Coverage   99.78%   99.78%           
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  Files          11       11           
  Lines         461      461           
  Branches       17       17           
=======================================
  Hits          460      460           
  Partials        1        1           

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