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Merge pull request #99 from mrlitong/feature/daily-monthly-token-stats

style: apply ruff import formatting to PR files

style: fix formatting for PR files only

chore: add local linting scripts to .gitignore

fix: resolve F841 unused variable in test_cli_main.py

style: fix linting issues identified by automated code review

fix: resolve test hanging issue in CI pipeline

style: comprehensive fix for all linting issues in PR

style: fix additional linting issues

style: fix linting issues identified by CodeRabbitAI

refactor: address code review suggestions from PR #99

Fix: Code quality improvements (linting issues)