fix(reporter): 修复 reporter 智能体的模型加载异常

src/agents/chatbot/graph.py

@@ -19,8 +19,6 @@ class ChatbotAgent(BaseAgent):
 
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
-        self.graph = None
-        self.checkpointer = None
         self.context_schema = Context
 
     async def get_tools(self, tools: list[str] = None, mcps=None, knowledges=None):

src/agents/reporter/graph.py

@@ -28,7 +28,7 @@ class SqlReporterAgent(BaseAgent):
 
         # 创建 SqlReporterAgent
         graph = create_agent(
-            model=load_chat_model(config.default_model),  # 默认模型，会被 middleware 覆盖
+            model=load_chat_model(context.model),  # 使用 context 中的模型配置
             system_prompt=context.system_prompt,
             tools=await self.get_tools(),
             checkpointer=await self._get_checkpointer(),