AdminRole was defined twice with unrelated shapes (core/auth's real
JWT role union vs. the Users admin page's display interface), flagged
in BACKEND-API-REFERENCE.md \u00a72b as needing a rename. Renamed the
Users-page one to AdminUserRoleRecord.
sellerId was bare string in admin-order/admin-product/item models
while core/sellers/models/seller-scope.model.ts already used the
shared UUID alias. Aligned all three to UUID for consistency (UUID is
currently just = string, so this is a documentation-level type change,
not a behavior change).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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