Add coa purchase and vendors

internal/mappers/unit_mapper.go

@@ -66,3 +66,22 @@ func MapUnitModelsToEntities(models []*models.Unit) []*entities.Unit {
 
 	return entities
 }
+
+// Entity to Response conversions
+func MapUnitEntityToResponse(entity *entities.Unit) *models.UnitResponse {
+	if entity == nil {
+		return nil
+	}
+
+	return &models.UnitResponse{
+		ID:             entity.ID,
+		OrganizationID: entity.OrganizationID,
+		OutletID:       entity.OutletID,
+		Name:           entity.Name,
+		Abbreviation:   entity.Abbreviation,
+		IsActive:       entity.IsActive,
+		DeletedAt:      entity.DeletedAt,
+		CreatedAt:      entity.CreatedAt,
+		UpdatedAt:      entity.UpdatedAt,
+	}
+}