refactor(api): standardize ValueSet label transformation across controllers
Replace manual label lookup code with ValueSet::transformLabels() helper
for consistent API responses across all controllers.
Updated controllers:
- ContactController: Specialty, Occupation
- OrderTestController: Priority, OrderStatus
- PatientController: Sex
- ContainerDefController: ConCategory, CapColor, ConSize
- SpecimenCollectionController: CollectionMethod, Additive, SpecimenRole
- SpecimenController: SpecimenType, SpecimenStatus, BodySite
- SpecimenStatusController: Status, Activity
- DemoOrderController: Priority, OrderStatus
- TestMapController: HostType, ClientType
- TestsController: Reference range fields
Also updated api-docs.yaml field naming convention to PascalCase