feat: restart to apply update, privileged helper, rollback

internal/domain/update/updateDomain.go

@@ -59,6 +59,7 @@ type UpdateStatus struct {
 	Progress   *Progress     `json:"progress"`
 	Error      *string       `json:"error"`
 	StartedAt  *time.Time    `json:"started_at"`
+	FinishedAt *time.Time    `json:"finished_at"`
 }
 
 func NewResult(release Release, checkedAt time.Time) CheckResult {