refactor: split CLI diagnosis and status rendering

internal/backendstatus/container.go

@@ -28,6 +28,8 @@ const (
 	codeDeploymentConfigMismatch  = "deployment_record_config_mismatch"
 )
 
+const inactiveSlotContainerMessage = "非活动槽位容器 "
+
 // diagnoseContainer 对 container 后端做只读诊断。
 // 事实来源是 backend_container_deployment 单例记录；现场状态由容器引擎与宿主 Nginx 提供。
 func (d *Diagnoser) diagnoseContainer(ctx context.Context) (daemonapi.Diagnosis, error) {
@@ -143,7 +145,7 @@ func (d *Diagnoser) containerFindings(ctx context.Context, deployment transactio
 		findings = append(findings, finding{
 			level:   daemonapi.DiagnosisLevelOK,
 			code:    codeInactiveContainerOK,
-			message: "非活动槽位容器 " + inactiveSlot.ContainerName + " 不存在",
+			message: inactiveSlotContainerMessage + inactiveSlot.ContainerName + " 不存在",
 		})
 	case inactiveErr != nil:
 		return nil, fmt.Errorf("inspect inactive backend container %s: %w", inactiveSlot.ContainerName, inactiveErr)
@@ -151,13 +153,13 @@ func (d *Diagnoser) containerFindings(ctx context.Context, deployment transactio
 		findings = append(findings, finding{
 			level:   daemonapi.DiagnosisLevelDrift,
 			code:    codeInactiveContainerRunning,
-			message: "非活动槽位容器 " + inactiveSlot.ContainerName + " 意外处于运行状态",
+				message: inactiveSlotContainerMessage + inactiveSlot.ContainerName + " 意外处于运行状态",
 		})
 	default:
 		findings = append(findings, finding{
 			level:   daemonapi.DiagnosisLevelFixable,
 			code:    codeInactiveContainerResidual,
-			message: "非活动槽位容器 " + inactiveSlot.ContainerName + " 已停止，属于残留",
+			message: inactiveSlotContainerMessage + inactiveSlot.ContainerName + " 已停止，属于残留",
 			action:  "移除残留的已停止容器 " + inactiveSlot.ContainerName,
 			fix:     &fixAction{kind: fixRemoveContainer, container: inactiveSlot.ContainerName},
 		})