Enhance entity extraction with better structured prompts:
- Reorganize prompt format for improved clarity and consistency
- Add XML-style formatting tags for better LLM parsing
- Include language parameter in keywords extraction cache key
- Fix language parameter usage in keywords_extraction prompt
Improve rerank module with chunking fixes:
- Fix top_n behavior to limit documents instead of chunks
- Add Cohere reranker support with proper chunking
- Improve error handling for rerank API responses
Update operate.py:
- Better entity extraction parsing and validation
- Improved cache key generation for multilingual support
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
- Read config from selected_rerank_func when env var missing
- Make api_key optional for rerank function
- Add response format validation with proper error handling
- Update Cohere rerank default to official API endpoint
- Add --enable-rerank CLI argument and ENABLE_RERANK env var
- Simplify rerank configuration logic to only check enable flag and binding
- Update health endpoint to show enable_rerank and rerank_configured status
- Improve logging messages for rerank enable/disable states
- Maintain backward compatibility with default value True
