feat(platform): expose missing source diagnosis

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

@@ -333,6 +333,9 @@ func buildVehicleSourceConsistency(statuses []VehicleSourceStatus, realtime []Re
 		if status.Online {
 			consistency.OnlineSourceCount++
 		}
+		if vehicleSourceEvidenceMissing(status) {
+			consistency.MissingProtocols = append(consistency.MissingProtocols, status.Protocol)
+		}
 	}
 	var minMileage, maxMileage float64
 	hasMileage := false
@@ -393,6 +396,16 @@ func buildVehicleSourceConsistency(statuses []VehicleSourceStatus, realtime []Re
 	return consistency
 }
 
+func vehicleSourceEvidenceMissing(status VehicleSourceStatus) bool {
+	return strings.TrimSpace(status.Protocol) != "" &&
+		!status.Online &&
+		strings.TrimSpace(status.LastSeen) == "" &&
+		!status.HasRealtime &&
+		!status.HasHistory &&
+		!status.HasRaw &&
+		!status.HasMileage
+}
+
 func applyVehicleSourceConsistencyDiagnosis(consistency *VehicleSourceConsistency) {
 	if consistency == nil {
 		return
@@ -413,6 +426,11 @@ func applyVehicleSourceConsistencyDiagnosis(consistency *VehicleSourceConsistenc
 		consistency.Severity = "error"
 		consistency.Title = "全部来源离线"
 		consistency.Detail = sourceCoverageDetail(consistency.SourceCount, consistency.OnlineSourceCount, "无法判断实时一致性。")
+	case len(consistency.MissingProtocols) > 0:
+		consistency.Status = "degraded"
+		consistency.Severity = "warning"
+		consistency.Title = "来源不完整"
+		consistency.Detail = sourceCoverageDetail(consistency.SourceCount, consistency.OnlineSourceCount, "车辆服务可用但缺少 "+strings.Join(consistency.MissingProtocols, "、")+" 来源。")
 	case consistency.OnlineSourceCount < consistency.SourceCount:
 		consistency.Status = "degraded"
 		consistency.Severity = "warning"
@@ -520,6 +538,8 @@ func buildVehicleServiceOverview(vin string, lookupKey string, resolution *Vehic
 		resolved = resolution.Resolved
 	}
 	applyVehicleServiceOverviewDerivedFields(overview, resolved)
+	overview.SourceConsistency.MissingProtocols = missingProtocolsFromStatuses(statuses)
+	applyVehicleSourceConsistencyDiagnosis(overview.SourceConsistency)
 	return overview
 }
 
@@ -532,6 +552,7 @@ func applyVehicleServiceOverviewDerivedFields(overview *VehicleServiceOverview,
 	overview.SourceConsistency = &VehicleSourceConsistency{
 		SourceCount:       overview.SourceCount,
 		OnlineSourceCount: overview.OnlineSourceCount,
+		MissingProtocols:  missingCanonicalProtocols(overview.Protocols),
 		Scope:             "all_sources",
 	}
 	applyVehicleSourceConsistencyDiagnosis(overview.SourceConsistency)
@@ -899,7 +920,8 @@ func buildVehicleServiceStatus(resolved bool, statuses []VehicleSourceStatus) *V
 			onlineSourceCount++
 		}
 	}
-	if sourceCount == 0 {
+	missingProtocols := missingProtocolsFromStatuses(statuses)
+	if sourceCount == 0 || sourceCount == len(missingProtocols) {
 		return &VehicleServiceStatus{
 			Status:            "no_data",
 			Severity:          "warning",
@@ -919,6 +941,16 @@ func buildVehicleServiceStatus(resolved bool, statuses []VehicleSourceStatus) *V
 			OnlineSourceCount: onlineSourceCount,
 		}
 	}
+	if len(missingProtocols) > 0 {
+		return &VehicleServiceStatus{
+			Status:            "degraded",
+			Severity:          "warning",
+			Title:             "来源不完整",
+			Detail:            sourceCoverageDetail(sourceCount, onlineSourceCount, "车辆服务可用但缺少 "+strings.Join(missingProtocols, "、")+" 来源。"),
+			SourceCount:       sourceCount,
+			OnlineSourceCount: onlineSourceCount,
+		}
+	}
 	if onlineSourceCount < sourceCount {
 		return &VehicleServiceStatus{
 			Status:            "degraded",
@@ -939,6 +971,16 @@ func buildVehicleServiceStatus(resolved bool, statuses []VehicleSourceStatus) *V
 	}
 }
 
+func missingProtocolsFromStatuses(statuses []VehicleSourceStatus) []string {
+	missing := make([]string, 0, len(statuses))
+	for _, status := range statuses {
+		if vehicleSourceEvidenceMissing(status) {
+			missing = append(missing, status.Protocol)
+		}
+	}
+	return missing
+}
+
 func buildVehicleCoverageServiceStatus(row VehicleCoverageRow) *VehicleServiceStatus {
 	if row.BindingStatus != "bound" {
 		return &VehicleServiceStatus{