Add the term reference and vocabulary list shapes

Problem/Motivation

Term references appear in nearly every response, usually as a compact triple of id, name and alias, sometimes as a full card. The hierarchical case — a term with its parents — is used for breadcrumbs and category trees and is currently rebuilt by hand in several places.

Proposed resolution

• term_ref: id, name, alias, with the option to include the parent chain.
• Translation handled at the term level, so a reference in a Ukrainian response carries the Ukrainian name.
• The full card case delegates to the card shape rather than duplicating it.
• Kernel coverage on a hierarchical vocabulary and on a term without a translation.

Remaining tasks

Everything.