feat(platform): summarize vehicle service status

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

@@ -73,6 +73,7 @@ type VehicleDetail struct {
 	Resolution      *VehicleIdentityResolution `json:"resolution,omitempty"`
 	Identity        *VehicleRow                `json:"identity,omitempty"`
 	RealtimeSummary *VehicleRealtimeRow        `json:"realtimeSummary,omitempty"`
+	ServiceStatus   *VehicleServiceStatus      `json:"serviceStatus,omitempty"`
 	Sources         []string                   `json:"sources"`
 	SourceStatus    []VehicleSourceStatus      `json:"sourceStatus"`
 	Realtime        []RealtimeLocationRow      `json:"realtime"`
@@ -82,6 +83,15 @@ type VehicleDetail struct {
 	Quality         Page[QualityIssueRow]      `json:"quality"`
 }
 
+type VehicleServiceStatus struct {
+	Status            string `json:"status"`
+	Severity          string `json:"severity"`
+	Title             string `json:"title"`
+	Detail            string `json:"detail"`
+	SourceCount       int    `json:"sourceCount"`
+	OnlineSourceCount int    `json:"onlineSourceCount"`
+}
+
 type VehicleSourceStatus struct {
 	Protocol    string `json:"protocol"`
 	Online      bool   `json:"online"`