Honor Bluelink EU evModeRange units when API returns miles

[Copilot]

Bluelink EU status responses can report EV range in miles (unit: 3), but range was previously treated as kilometers. This caused underreported range in evcc while odometer parsing remained correct.

• Range unit handling (EU Bluelink)

  • Extended vehicle/bluelink range model to parse evModeRange.unit.
  • Updated VehicleStatus.Range() to convert miles to kilometers before returning the backend canonical distance value.
  • Kept kilometer behavior unchanged.

• Conversion semantics

  • Added explicit constants for unit mapping (unitMiles = 3) and conversion factor (kmPerMile = 1.60934).
  • Used math.Round for stable integer conversion when normalizing miles to km.

• Coverage for regression-prone paths

  • Added focused tests for:
    • miles → km conversion on evModeRange
    • unchanged handling for kilometer values
    • not-available behavior when range data is missing

value := dist[0].RangeByFuel.EvModeRange.Value
if dist[0].RangeByFuel.EvModeRange.Unit == unitMiles {
	return int64(math.Round(value * kmPerMile)), nil
}
return int64(value), nil

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