Fix api_server: fix json loads/dumps

pqai_agent_server/api_server.py

@@ -382,9 +382,9 @@ def get_native_agent_configuration():
             'execution_model': agent.execution_model,
             'system_prompt': agent.system_prompt,
             'task_prompt': agent.task_prompt,
-            'tools': agent.tools,
-            'sub_agents': agent.sub_agents,
-            'extra_params': agent.extra_params,
+            'tools': json.loads(agent.tools),
+            'sub_agents': json.loads(agent.sub_agents),
+            'extra_params': json.loads(agent.extra_params),
             'create_time': agent.create_time.strftime('%Y-%m-%d %H:%M:%S'),
             'update_time': agent.update_time.strftime('%Y-%m-%d %H:%M:%S')
         }
@@ -407,6 +407,8 @@ def save_native_agent_configuration():
     tools = json.dumps(req_data.get('tools', []))
     sub_agents = json.dumps(req_data.get('sub_agents', []))
     extra_params = req_data.get('extra_params', {})
+    if isinstance(extra_params, dict):
+        extra_params = json.dumps(extra_params)
 
     if not name:
         return wrap_response(400, msg='name is required')