修复智能体最近的最后连接时间为空的bug

--AgentServiceImpl.java 修复bug

main/manager-api/src/main/java/xiaozhi/modules/agent/service/impl/AgentServiceImpl.java

@@ -21,6 +21,7 @@ import xiaozhi.modules.agent.dao.AgentDao;
 import xiaozhi.modules.agent.dto.AgentDTO;
 import xiaozhi.modules.agent.entity.AgentEntity;
 import xiaozhi.modules.agent.service.AgentService;
+import xiaozhi.modules.device.service.DeviceService;
 import xiaozhi.modules.model.service.ModelConfigService;
 import xiaozhi.modules.timbre.service.TimbreService;
 
@@ -31,6 +32,9 @@ public class AgentServiceImpl extends BaseServiceImpl<AgentDao, AgentEntity> imp
     @Autowired
     private TimbreService timbreModelService;
 
+    @Autowired
+    private DeviceService deviceService;
+
     @Autowired
     private ModelConfigService modelConfigService;
 
@@ -104,6 +108,11 @@ public class AgentServiceImpl extends BaseServiceImpl<AgentDao, AgentEntity> imp
             // 获取设备数量
             dto.setDeviceCount(getDeviceCountByAgentId(agent.getId()));
 
+            // 获取智能体最近的最后连接时长
+            dto.setLastConnectedAt(deviceService.getLatestLastConnectionTime(agent.getId()));
+
+
+
             return dto;
         }).collect(Collectors.toList());
     }