feat(clients): hard-delete with email-code confirmation (single + bulk)

Permanent client deletion is now reachable from:
- archived single-client detail page (icon button, gated by new
  admin.permanently_delete_clients perm)
- archived clients list bulk action

Both flows are 2-stage: request a 4-digit code (sent to operator's
account email, 10min Redis TTL), then enter both code AND a typed
confirmation (client name single, "DELETE N CLIENTS" bulk). Cascade
strategy preserves audit trails: signed documents, email threads,
files and reminders are detached but retained; addresses, contacts,
notes, portal user, GDPR records, interests and reservations are
deleted via FK cascade or explicit tx delete.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/admin/roles/role-form.tsx

@@ -84,6 +84,7 @@ const DEFAULT_PERMISSIONS: Record<string, Record<string, boolean>> = {
     manage_forms: false,
     manage_tags: false,
     system_backup: false,
+    permanently_delete_clients: false,
   },
   residential_clients: { view: false, create: false, edit: false, delete: false },
   residential_interests: {