After the admin account is created (and we're logged in), the wizard now
shows an opt-in feature step instead of jumping straight to the dashboard.
Grouped ticks (Client management / Accounting / Automation) map to the
existing feature flags; galleries/analytics/userManagement stay always-on
and are noted, not listed.
- Selection is saved via the existing authenticated PUT /admin/feature-flags,
whose server-side applyDependencyRules resolves dependencies (e.g. Invoices
pulls in Accounting) — the wizard only sends raw ticks.
- Labels/descriptions reuse settings.features.<key>.title/description so
translations stay in sync (en + de verified for all 14 features).
- Saving is best-effort: on failure the admin still enters the app and can
set features later in Settings.
- New en/de strings for the usage step.
Option A (lean wizard): this is the feature-selection foundation; per-feature
hard-required config steps + the restore-from-backup branch come next.