推进活动列表第一刀与联调回归

backend/internal/service/event_play_service.go

@@ -129,7 +129,7 @@ func (s *EventPlayService) GetEventPlay(ctx context.Context, input EventPlayInpu
 		}
 	}
 
-	canLaunch := event.Status == "active" && event.CurrentReleaseID != nil && event.ManifestURL != nil
+	canLaunch, launchReason := evaluateEventLaunchReadiness(event)
 	result.Play.CanLaunch = canLaunch
 	if canLaunch {
 		result.Play.LaunchSource = LaunchSourceEventCurrentRelease
@@ -141,13 +141,13 @@ func (s *EventPlayService) GetEventPlay(ctx context.Context, input EventPlayInpu
 		result.Play.Reason = "user has an ongoing session for this event"
 	case canLaunch:
 		result.Play.PrimaryAction = "start"
-		result.Play.Reason = "event is active and launchable"
+		result.Play.Reason = launchReason
 	case result.Play.RecentSession != nil:
 		result.Play.PrimaryAction = "review_last_result"
-		result.Play.Reason = "event is not launchable, but user has previous session history"
+		result.Play.Reason = launchReason + ", but user has previous session history"
 	default:
 		result.Play.PrimaryAction = "unavailable"
-		result.Play.Reason = "event is not launchable"
+		result.Play.Reason = launchReason
 	}
 
 	return result, nil