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
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