Adds .gitea/workflows/lint.yml running flake8 with .flake8 config.
Removes unused sys/urllib.request imports (F401).
Removes f prefix from 52 f-strings that had no placeholders (F541).
Auto-fixes trailing whitespace in blank lines (W293) via autopep8.
Fixes over-indentation in LXC storage check try block (E117).
Config ignores F841 (unused locals) and E501 (long lines).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
