Matt 661187cc79 feat(client-groups): CM-1 data layer — groups entity, membership, service, Mailchimp scaffold
- client_groups + client_group_members tables (migration 0094, port_id cascade)
- client_groups permission resource (view/manage) in catalog + role backfill
- service: CRUD + wipe-and-rewrite membership + member email resolution
- mailchimp.service scaffold: config reader + inert one-way sync (mapping
  deferred until the client's MC account is wired, per CM-1 decision)
- 4 integration tests (CRUD, membership, email resolution, port-scope guard)

Backend only — API routes + UI to follow. tsc clean, 1635 vitest pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-18 22:28:20 +02:00
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