Task T10 evidence: configured Namenseinblender macro

RED:
- `ddev exec php artisan test tests/Feature/NameTagSlideBuilderTest.php`
- Failed with `Target class [App\Services\NameTagSlideBuilder] does not exist.` before implementation.

GREEN:
- `ddev exec php artisan test tests/Feature/NameTagSlideBuilderTest.php`
- Result: 3 passed (4 assertions).

Full verification:
- `ddev exec php artisan test`
- Result: 544 passed (2703 assertions).
- `ddev exec ./vendor/bin/pint`
- Result: PASS, 213 files.

Configured macro contract verified by test:
- text: `Anna Müller\nModeration`
- macro keys: `name`, `uuid`, `collectionName`, `collectionUuid`