feat: add nullable outlet_id to product

internal/transformer/product_transformer.go

@@ -39,6 +39,7 @@ func CreateProductRequestToModel(apctx *appcontext.ContextInfo, req *contract.Cr
 
 	return &models.CreateProductRequest{
 		OrganizationID: apctx.OrganizationID,
+		OutletID:       req.OutletID,
 		CategoryID:     req.CategoryID,
 		SKU:            req.SKU,
 		Name:           req.Name,
@@ -60,7 +61,8 @@ func UpdateProductRequestToModel(req *contract.UpdateProductRequest) *models.Upd
 	}
 
 	return &models.UpdateProductRequest{
-		CategoryID:  req.CategoryID,
+		OutletID:     req.OutletID,
+		CategoryID:   req.CategoryID,
 		SKU:         req.SKU,
 		Name:        req.Name,
 		Description: req.Description,
@@ -100,6 +102,7 @@ func ProductModelResponseToResponse(prod *models.ProductResponse) *contract.Prod
 	return &contract.ProductResponse{
 		ID:             prod.ID,
 		OrganizationID: prod.OrganizationID,
+		OutletID:       prod.OutletID,
 		CategoryID:     prod.CategoryID,
 		CategoryName:   prod.CategoryName,
 		SKU:            prod.SKU,