Align with useProducts pattern: loaded flag, cache-first return,
loading guard, and clearCache helper to avoid redundant API calls.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Create shared/utils/apiHelpers.ts with generic extractCollection<T>()
that handles hydra:member, member, items, data, and array formats.
Replace 7 local implementations in CRUD composables.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>