ci: Replace isort and flake8 with ruff check

[fsbraun]

Replaces isort and flake8 with ruff check.

• Remove the flake8/isort lint GitHub action: linting is covered by pre-commit
• Replace the flake8, isort and yesqa (flake8-based) pre-commit hooks with ruff-check (v0.16.10)
• Move the flake8/isort configuration into [tool.ruff] in pyproject.toml (line length, excludes, import sections incl. django/cms, first-party package, lines after imports)
• Replace flake8/isort tox envs with a ruff env and drop flake8/isort from test requirements
• Apply ruff check --fix (import sorting only) so the codebase passes

🤖 Generated with Claude Code

Summary by Sourcery

Replace the separate flake8 and isort linting stack with Ruff across development hooks, configuration, and tox environments.

Enhancements:

• Consolidate Python linting and import sorting under Ruff with equivalent project-specific rules and automatic fixes.

Build:

• Replace the separate flake8, isort, and yesqa tooling and tox environments with Ruff, and remove the redundant lint dependencies.

CI:

• Remove the standalone lint GitHub Actions workflow because linting is handled by pre-commit.

Chores:

• Apply Ruff's import-order corrections across the codebase and clean up related configuration formatting.

[sourcery-ai]

Reviewer's Guide

Migrates linting and import sorting from Flake8/isort to Ruff, using a Ruff pre-commit hook with autofix, consolidated pyproject configuration, and a tox/test-dependency update; the resulting import-only source changes make the codebase pass the new checks.

File-Level Changes

Change	Details	Files
Replace the existing Flake8/isort linting workflow with Ruff-based pre-commit checks.	Delete the dedicated GitHub Actions lint workflow. Replace Flake8, isort, and yesqa hooks with Ruff pre-commit at v0.16.10. Enable Ruff autofixing for import sorting.	.github/workflows/lint.yml .pre-commit-config.yaml
Consolidate lint and import-order configuration under Ruff.	Configure line length, exclusions, E/W/F/I rule selection, and Django/CMS import sections. Preserve the first-party package and import-spacing settings in Ruff's isort-compatible configuration.	pyproject.toml
Update project source and test tooling to satisfy the Ruff migration.	Apply Ruff import reordering in the affected Django modules. Replace Flake8/isort tox environments and remove their test requirements.	djangocms_link/fields.py djangocms_link/models.py tests/requirements/base.txt tox.ini

---

Tips and commands

Interacting with Sourcery

• Trigger a new review: Comment @sourcery-ai review on the pull request.
• Continue discussions: Reply directly to Sourcery's review comments.
• Generate a GitHub issue from a review comment: Ask Sourcery to create an
  issue from a review comment by replying to it. You can also reply to a
  review comment with @sourcery-ai issue to create an issue from it.
• Generate a pull request title: Write @sourcery-ai anywhere in the pull
  request title to generate a title at any time. You can also comment
  @sourcery-ai title on the pull request to (re-)generate the title at any time.
• Generate a pull request summary: Write @sourcery-ai summary anywhere in
  the pull request body to generate a PR summary at any time exactly where you
  want it. You can also comment @sourcery-ai summary on the pull request to
  (re-)generate the summary at any time.
• Generate reviewer's guide: Comment @sourcery-ai guide on the pull
  request to (re-)generate the reviewer's guide at any time.
• Resolve all Sourcery comments: Comment @sourcery-ai resolve on the
  pull request to resolve all Sourcery comments. Useful if you've already
  addressed all the comments and don't want to see them anymore.
• Dismiss all Sourcery reviews: Comment @sourcery-ai dismiss on the pull
  request to dismiss all existing Sourcery reviews. Especially useful if you
  want to start fresh with a new review - don't forget to comment
  @sourcery-ai review to trigger a new review!

Customizing Your Experience

Access your dashboard to:

• Enable or disable review features such as the Sourcery-generated pull request
  summary, the reviewer's guide, and others.
• Change the review language.
• Add, remove or edit custom review instructions.
• Adjust other review settings.

Getting Help

• Contact our support team for questions or feedback.
• Visit our documentation for detailed guides and information.
• Keep in touch with the Sourcery team by following us on X/Twitter, LinkedIn or GitHub.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.29%. Comparing base (a87be01) to head (fc39813).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #265      +/-   ##
==========================================
- Coverage   95.31%   95.29%   -0.02%     
==========================================
  Files          29       29              
  Lines         789      787       -2     
  Branches      112      112              
==========================================
- Hits          752      750       -2     
  Misses         16       16              
  Partials       21       21              

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.