add battery_capacity_kwh field to match fuel_tank_capacity_gal

Add BatteryCapacityKwh to DrivlyVINResponse, Vincario metadata map,
and VehicleInfo struct so EV battery capacity is a first-class field.

Author: zer0stars

internal/core/models/device_definition_models.go

@@ -42,7 +42,8 @@ type VehicleInfo struct {
 	VehicleType         string `json:"vehicle_type,omitempty"` // VehicleType PASSENGER CAR, from NHTSA
 	MPGHighway          string `json:"mpg_highway,omitempty"`
 	MPGCity             string `json:"mpg_city,omitempty"`
-	FuelTankCapacityGal string `json:"fuel_tank_capacity_gal,omitempty"`
+	FuelTankCapacityGal  string `json:"fuel_tank_capacity_gal,omitempty"`
+	BatteryCapacityKwh   string `json:"battery_capacity_kwh,omitempty"`
 	MPG                 string `json:"mpg,omitempty"`
 }
 

internal/core/models/vin_decoding_models.go

@@ -303,6 +303,7 @@ func (v *VincarioInfoResponse) GetMetadata() (null.JSON, error) {
 		"mpg_highway":            nil,
 		"mpg_city":               nil,
 		"fuel_tank_capacity_gal": nil,
+		"battery_capacity_kwh":   nil,
 		"mpg":                    nil,
 	}
 
@@ -359,6 +360,7 @@ type DrivlyVINResponse struct {
 	Wheelbase                string   `json:"wheelbase"`
 	Fuel                     string   `json:"fuel"`
 	FuelTankCapacityGal      float64  `json:"fuelTankCapacityGal"`
+	BatteryCapacityKwh       float64  `json:"batteryCapacityKwh"`
 	Mpg                      int      `json:"mpg"`
 	MpgCity                  int      `json:"mpgCity"`
 	MpgHighway               int      `json:"mpgHighway"`