v0.2.0 — Initial PyPI Release

Fix ruff lint errors: remove unused imports, modernize type hints

- Remove unused imports (csv, io, lru_cache, Optional, unittest.mock)
- Replace Optional[X] with X | None (UP045)
- Replace str(Enum) with StrEnum (UP042)
- Remove unused variables (except as e → except Exception)
- Remove unused month_names_de variable
- Sort imports in test_server.py (I001)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>