Fix logging output in evaluation test harness and examples:
- Replace print() statements with logger calls in e2e_test_harness.py
- Update copy_llm_cache_to_another_storage.py to use logger instead of print
- Remove redundant logging configuration in copy_llm_cache_to_another_storage.py
Fix path handling and typos:
- Correct makedirs() call in lightrag_openai_demo.py to create log_dir directly
- Update constants.py comments to clarify SOURCE_IDS_LIMIT_METHOD options
- Remove duplicate return statement in utils.py normalize_extracted_info()
- Fix error string formatting in chroma_impl.py with !s conversion
- Remove unused pipmaster import from chroma_impl.py
Format entire codebase with ruff and add type hints across all modules:
- Apply ruff formatting to all Python files (121 files, 17K insertions)
- Add type hints to function signatures throughout lightrag core and API
- Update test suite with improved type annotations and docstrings
- Add pyrightconfig.json for static type checking configuration
- Create prompt_optimized.py and test_extraction_prompt_ab.py test files
- Update ruff.toml and .gitignore for improved linting configuration
- Standardize code style across examples, reproduce scripts, and utilities
