feat(platform): add online statistics summary

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

@@ -265,6 +265,16 @@ type MileageSummary struct {
 	AverageMileagePerVIN float64 `json:"averageMileagePerVin"`
 }
 
+type OnlineStatisticsSummary struct {
+	VehicleCount        int            `json:"vehicleCount"`
+	OnlineVehicleCount  int            `json:"onlineVehicleCount"`
+	OfflineVehicleCount int            `json:"offlineVehicleCount"`
+	OnlineRatePercent   float64        `json:"onlineRatePercent"`
+	RedisOnlineKeys     *int           `json:"redisOnlineKeys"`
+	ProtocolStats       []ProtocolStat `json:"protocolStats"`
+	Evidence            string         `json:"evidence"`
+}
+
 type QualityIssueRow struct {
 	VIN            string `json:"vin"`
 	Plate          string `json:"plate"`