Deploy 3: Onboarding wizard + empty states + docs operationale

- 3-step onboarding wizard at /app/onboarding (auto-redirected via
  RequireOnboarding middleware on first login per tenant)
- Empty states with icon + heading + description on Client, Vehicle,
  WorkOrder, Lead, Part lists
- Docs: operations/{api,i18n,2fa,monitoring}.md, stack/reverb.md
- Updated 00-index.md and journal.md with status of all 15 items

app/Providers/Filament/TenantPanelProvider.php

@@ -70,6 +70,7 @@ class TenantPanelProvider extends PanelProvider
                 AddQueuedCookiesToResponse::class,
                 StartSession::class,
                 \App\Http\Middleware\SetLocale::class,
+                \App\Http\Middleware\RequireOnboarding::class,
                 AuthenticateSession::class,
                 ShareErrorsFromSession::class,
                 VerifyCsrfToken::class,