LLM和TTS采用适配器模式进行解耦，方便扩展更多服务平台调用

core/providers/llm/base.py

@@ -0,0 +1,7 @@
+from abc import ABC, abstractmethod
+
+class LLMProviderBase(ABC):
+    @abstractmethod
+    def response(self, session_id, dialogue):
+        """LLM response generator"""
+        pass