Integrate Pylint CI

[galjos]

Summary

• add a Pylint optional dependency and project threshold
• run Pylint in CI before tests
• simplify startup log timestamp and log-file env handling

Validation

• python -m pylint ThermoScreening
• python -m pytest -q

Closes #11

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.19%. Comparing base (d90b781) to head (9c2f5de).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   87.01%   87.19%   +0.17%     
==========================================
  Files          20       20              
  Lines        1063     1062       -1     
==========================================
+ Hits          925      926       +1     
+ Misses        138      136       -2     

Flag	Coverage Δ
unittests	87.19% <100.00%> (+0.17%)	⬆️

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