Locations — group types

The GraphQL API now exposes group types on the Practice and PracticeLocation types.

New fields:

• Practice.groupTypes ([PracticeLocationType]) — the list of location types configured for the practice.
• PracticeLocation.groupType (PracticeLocationType) — the type assigned to the location, or null if none.

New type:

• PracticeLocationType — id (ID!) and name (String!).

This is an additive change. Existing queries are unaffected.