Add system_prompt passing to CodeAgent config

agent.py

@@ -111,6 +111,7 @@ class QAgent:
         self.agent = CodeAgent(
             tools=self.tools,
             model=self.model,
+            system_prompt=self.system_prompt,
             # additional_authorized_imports=self.imports,
             # executor_type=executor_type,
             # executor_kwargs=executor_kwargs,