087ef45942
Implements the recurring-customer login surface from the-luap/picpeak#354 plugged into the maintainer's new feature-flag infrastructure (PR #443) instead of a parallel toggle. * New `customerPortal` feature flag (foundation flag for the not-yet-built calendar/quotes/bills/messaging customer surfaces). Defaults FALSE on fresh installs, TRUE on existing installs (events > 0) via migration 095 so live customer accounts don't disappear mid-deployment. * Foundation schema: customer_accounts, customer_invitations, event_customer_assignments, customer_password_resets, plus RBAC permissions customers.view / .create / .delete granted to super_admin + admin system roles. * Backend: /api/admin/customers (invite, list, search, assign, deactivate, reset password) + /api/customer/auth/* + /api/customer/* (login, dashboard, accept-invite, reset). Customer JWT bypass minted via /api/customer/events/:slug/access-token so existing gallery middleware stays untouched. * Frontend: /customer/* route tree gated by RequireFeature flag customerPortal, with login / dashboard / accept-invite / reset pages and a customer-side sidebar layout. /admin/customers and /admin/customers/:id gated identically. * Settings → Features grows a "Customers" section with a Customer portal card. The maintainer's Features tab stays the single source of truth — no parallel Advanced features tab. * CustomerAccountPicker on event create/edit forms hides itself when the flag is off; backend ignores customer_account_ids in that case instead of erroring the whole event save. Translations: en + de hand-translated. nl/pt/ru fall through to en — flagged here as needing native review. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>