feat: remove code

[earayu]

Note

Removes legacy query paths (kg/naive and LightRAG.aquery) and introduces a new context-only aquery_context, while cleaning prompts and simplifying types.

• RAG Query APIs:
  • Remove kg_query and naive_query from operate.py and their usage/imports.
  • Remove LightRAG.aquery(...) method.
  • Add LightRAG.aquery_context(...) to build and return sanitized KG/DC context (strips file_path).
• Context Building:
  • Extend vector context to include file_path/created_at; propagate file_path through entity/relation/text contexts.
• Prompts:
  • Remove PROMPTS["DEFAULT_USER_PROMPT"] and deprecated similarity_check prompt.
• Types/Cleanup:
  • Drop AsyncIterator type hints and related return types.
  • Minor logging/validation improvements and consistency tweaks across context construction.

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