Adds the first admin screen — /tenants — listing tenants from
GET /api/v1/admin/tenants with search, status badges, plan, created
date, and a per-row menu with suspend / activate / deactivate actions.
Hand-typed shapes in app/lib/arcadia/tenants.ts because arcadia's admin
endpoints aren't yet covered by /api/openapi (same 'ok'-placeholder
issue documented in lib-arcadia-client/scripts/sync-spec.mjs). When
the spec gains coverage, switch to arcadia.typed.GET(...) and drop the
manual types.
Trims the inherited consumer-app sidenav (Resources / Assistant / AI /
Library) down to admin-shaped items: Overview, Tenants, Audit log,
Settings. The unused route files stay in place; they just aren't linked.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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