Bluelink: convert evModeRange and odometer from miles to km when unit=3

[andig]

Fixes #29728

Summary

The Hyundai/Kia EU Bluelink API returns range and odometer values with a unit code (1 = km, 3 = miles), but the EU package ignored the field entirely and treated all values as kilometers. UK Bluelink users (where the car defaults to miles) saw their reported EV range presented at ~62% of its real value. The odometer parser had the same latent bug — the reporter happened to receive unit: 1 for odometer in #29728, but a user whose car reports odometer in miles would have hit the same problem.

Change

• EvModeRange and Odometer now carry the Unit field through JSON.
• VehicleStatus.Range() and StatusLatestResponse.Odometer() convert miles → km when Unit == 3, matching the existing pattern in vehicle/bluelink_us (same kmPerMile = 1.60934 constant, same rounding for the int range).
• Added vehicle/bluelink/types_test.go with regression tests that use the exact payload reported in When Bluelink API returns range as miles, evcc treats them as km #29728 plus a miles-odometer case.

Test plan

• go test ./vehicle/bluelink/... — all subtests pass (range km, range miles, odometer km, odometer miles, missing fields)
• go test ./vehicle/... — full vehicle test suite green
• go vet ./vehicle/bluelink/..., gofmt -l vehicle/bluelink/, golangci-lint run ./vehicle/bluelink/... — all clean

🤖 Generated with Claude Code

[sourcery-ai]

Hey - I've left some high level feedback:

• The kmPerMile constant and miles→km conversion logic now duplicated from vehicle/bluelink_us could be refactored into a shared helper or common package to avoid divergence between regions in future changes.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `kmPerMile` constant and miles→km conversion logic now duplicated from `vehicle/bluelink_us` could be refactored into a shared helper or common package to avoid divergence between regions in future changes.

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