feat: add ReferenceItem model and update QuickEvaluation FKs
- Create ReferenceitemModel with type, name, parent (self FK), order, is_active fields
- Add ReferenceType choices: brand, marka, color, fuel_type, body_type, car_position, state_car
- Implement ReferenceItem API (list, retrieve) with filter by type/parent/is_active, search, ordering
- Add ReferenceItem admin with list_filter, search, inline editing
- Change QuickEvaluation FK fields from shared.OptionsModel to evaluation.ReferenceitemModel
- Update serializers and views to use .name instead of .key
- Add ReferenceItem to unfold admin navigation
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