fix(platform): clarify vehicle service status labels

vehicle-data-platform/apps/api/internal/platform/handler_test.go

@@ -159,6 +159,9 @@ func TestHandlerVehicleCoverageTreatsMissingCanonicalSourceAsDegraded(t *testing
 		if row.ServiceStatus == nil || row.ServiceStatus.Status != "degraded" {
 			t.Fatalf("missing canonical source should degrade vehicle service, got row=%+v body=%s", row, rec.Body.String())
 		}
+		if row.ServiceStatus.Title != "来源不完整" {
+			t.Fatalf("missing canonical source should use explicit incomplete-source title, got row=%+v body=%s", row, rec.Body.String())
+		}
 	}
 }
 
@@ -410,6 +413,9 @@ func TestHandlerVehicleServiceSummaryEndpoint(t *testing.T) {
 	}
 	noDataStatusFound := false
 	for _, status := range body.Data.ServiceStatuses {
+		if status.Status == "degraded" && status.Title != "来源异常" {
+			t.Fatalf("summary degraded status should use broad source exception title, got %+v", status)
+		}
 		if status.Status == "no_data" {
 			noDataStatusFound = true
 			if status.Title != "暂无数据来源" || status.Count != body.Data.NoDataVehicles {