test: add service and controller tests for vehicle lookup
- Add real HTML fixture from biluppgifter.se/fordon/hdo732/ containing:
summary cards (.info > em + span) for Modellar, Typ, Farg, Bransle
Fordonsdata section (ul.list with span.label/span.value) for Fabrikat, Modell, Variant, Fordonsar/Modellar
- Add VehicleLookupServiceTest with 6 cases:
shouldParseAllFieldsFromFixture, shouldParseSummaryFields,
shouldParseDataSectionFields, shouldReturnEmptyFieldsForEmptyDocument,
shouldBuildModelWithoutVariant, shouldFallbackToModellarWhenNoFordonsar
- Add VehicleControllerTest with 4 cases:
shouldReturnVehicleInfoForValidPlate (200 with all fields),
shouldReturn404WhenVehicleNotFound, shouldBeAccessibleWithoutAuthentication,
shouldReturnVehicleInfoWithFuelField