fix: preserve reasoning_content in conversation history for thinking models

nanobot/providers/base.py

@@ -20,6 +20,7 @@ class LLMResponse:
     tool_calls: list[ToolCallRequest] = field(default_factory=list)
     finish_reason: str = "stop"
     usage: dict[str, int] = field(default_factory=dict)
+    reasoning_content: str | None = None  # Kimi, DeepSeek-R1 etc.
     
     @property
     def has_tool_calls(self) -> bool:

nanobot/providers/litellm_provider.py

@@ -183,11 +183,14 @@ class LiteLLMProvider(LLMProvider):
                 "total_tokens": response.usage.total_tokens,
             }
         
+        reasoning_content = getattr(message, "reasoning_content", None)
+        
         return LLMResponse(
             content=message.content,
             tool_calls=tool_calls,
             finish_reason=choice.finish_reason or "stop",
             usage=usage,
+            reasoning_content=reasoning_content,
         )
     
     def get_default_model(self) -> str: