Look up a real vehicle by VIN or registration (Beta)

Added

• /vin/{vin} — decodes a 17-character VIN (make, model, year, trim, body, engine, transmission, drivetrain) and returns the closest catalogue match with one signed image_url per view your plan allows. Read vehicle.confidence to judge the match; vehicle.matched: false means nothing suitable exists, and the decoded data is still returned.
• /plate/{plate} — the same for a registration number, with ?country= for non-UK plates. The detected paint colour is mapped onto a catalogue colour and applied to the images automatically.
• features.vin, features.plate and features.search_allowed in /api/me — both lookups are opt-in per key and return 403 until enabled.

Improved

• Invalid VINs and registration numbers are rejected with 400 before any lookup is made, so a typo never costs a request.