refactor: parallelize CI jobs and apply ruff formatting

[raman325]

Summary

Refactor CI workflow to run jobs in parallel with faster package installation.

Proposed change

CI Parallelization

Split the workflow into parallel jobs for faster feedback:

• tests: runs pytest with requirements_test.txt
• lint: runs ruff format/check with requirements_lint.txt
• mypy: runs mypy with requirements_lint.txt
• coverage: uploads coverage after tests complete (depends on tests job)

Performance Improvements

• Use uv instead of pip for significantly faster package installation
• Each job installs only the dependencies it needs (no tox overhead)

Code Formatting

• Applied ruff format to entire codebase (38 files reformatted)
• Removed deprecated UP038 rule from ruff config (rule was removed from ruff)

Dependency Cleanup

• Removed tox from requirements and pyproject.toml since CI runs commands directly
• Added pytest-cov to requirements_test.txt for coverage support

Type of change

• Code quality improvements to existing code or addition of tests

Additional information

• This PR is related to issue: follows refactor: split requirements into test, lint, and dev #544 (requirements split)

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Codecov Report

❌ Patch coverage is 74.19355% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.17%. Comparing base (a9a30ef) to head (f6f76e6).
⚠️ Report is 7 commits behind head on beta.

Files with missing lines	Patch %	Lines
custom_components/keymaster/coordinator.py	65.57%	21 Missing ⚠️
custom_components/keymaster/migrate.py	75.00%	2 Missing ⚠️
custom_components/keymaster/helpers.py	88.88%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             beta     #545      +/-   ##
==========================================
+ Coverage   80.86%   82.17%   +1.31%     
==========================================
  Files          19       21       +2     
  Lines        2341     2491     +150     
==========================================
+ Hits         1893     2047     +154     
+ Misses        448      444       -4     

Flag	Coverage Δ
python	82.17% <74.19%> (?)

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Pull request overview

This PR refactors the CI workflow to run Python checks (pytest, lint, mypy) in parallel instead of sequentially through tox, improving feedback speed and reducing dependency installation overhead.

Changes:

• Split single tox job into four parallel jobs: tests, lint, mypy, and coverage
• Removed tox dependency from CI and install requirements directly from split requirement files
• Changed lint job to use ruff format --check (appropriate for CI) instead of ruff format

Comments suppressed due to low confidence (2)

.github/workflows/pytest.yaml:32

• The matrix strategy only includes Python 3.13, but the old tox configuration (in pyproject.toml) also tested against Python 3.14. Consider whether testing against multiple Python versions should be preserved, or if this is an intentional change to reduce CI time.

    strategy:
      matrix:
        python-version:
          - "3.13"

.github/workflows/pytest.yaml:87

• The coverage job is missing a name attribute. Add a name to maintain consistency with the other jobs (tests, lint, mypy) and improve readability in the GitHub Actions UI.

  coverage:
    runs-on: ubuntu-latest
    needs: tests

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