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/Filament/Tenant/Resources/VehicleResource.php

@@ -96,6 +96,9 @@ class VehicleResource extends Resource
                 Actions\EditAction::make(),
                 Actions\DeleteAction::make(),
             ])
+            ->emptyStateHeading('Nicio mașină încă')
+            ->emptyStateDescription('Adaugă mașini manual sau importă din CSV. Folosește VIN-căutare pentru decoder rapid și completare automată brand/model/an.')
+            ->emptyStateIcon('heroicon-o-truck')
             ->defaultSort('created_at', 'desc');
     }