Completely refactor the LLM integration method to easily replace the LLM used by each module and optimize the retransmission mechanism.

InsightEngine/llms/__init__.py

@@ -1,11 +1,8 @@
 """
-LLM调用模块
-支持多种大语言模型的统一接口
+LLM module
+Provides a unified OpenAI-compatible client for the Insight Engine.
 """
 
-from .base import BaseLLM
-from .deepseek import DeepSeekLLM
-from .openai_llm import OpenAILLM
-from .kimi import KimiLLM
+from .base import LLMClient
 
-__all__ = ["BaseLLM", "DeepSeekLLM", "OpenAILLM", "KimiLLM"]
+__all__ = ["LLMClient"]