Allow users to provide keywords with QueryRequest

[Mobious]

Description

This change allows API users to provide their own high-level and low-level keywords to the /query endpoints. This prevents the server from having the LLM generate the keywords.

This change allows users to fetch data from LightRAG with 0 LLM calls (by providing hl_keywords, ll_keywords, and setting only_need_prompt or only_need_context to True).

Related Issues

The PR implements feature request #2249

Changes Made

• add hl_keywords and ll_keywords to the QueryRequest class
• added usage examples in the endpoint docstrings

Checklist

• Changes tested locally
• Code reviewed
• Documentation updated (if necessary)
• Unit tests added (if applicable)

[danielaskdd]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

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[danielaskdd]

Thanks for sharing.