Wire three GET endpoints behind the existing admin middleware so the
admin app can browse workspaces alongside users:
GET /admin/organizations list with q/cursor/limit/sort
GET /admin/organizations/:id detail + plan/sub + limits + counts
GET /admin/organizations/:id/members full member list with joined users
The list query inlines member/email-account/campaign/active-campaign
counts via subqueries so the table can render usage without an extra
fetch per row. Detail layers GetOrganizationLimits + GetOrganizationCounts
on top of the list shape, ensuring admin sees the same numbers the in-app
limit checks enforce.
Gated on AdminPermViewUsers for now since orgs are tightly coupled to
user admin context today; a dedicated ViewOrganizations/ManageOrganizations
pair will land alongside the write paths (per-org overrides, ban scope)
in the next slice.
Matt
4b7a0be93d