feat: support product quantity and separate steps

shop/lib/license-transform.ts

@@ -91,7 +91,8 @@ export function buildOrderSnapshot(
   categories: Category[],
   billingInterval?: 'one_time' | 'monthly',
   moduleQuantities?: Record<string, number>,
-  lastLicenseDate?: string | null
+  lastLicenseDate?: string | null,
+  productQuantities?: Record<string, number>
 ): OrderSnapshot {
   const items: OrderItem[] = []
   let subtotal = 0
@@ -135,11 +136,12 @@ export function buildOrderSnapshot(
           }
         })
 
+      const productQty = productQuantities?.[prod.id] || 1
       const moduleTotal = selectedModules.reduce((acc, m) => acc + (m.total_price || m.price), 0)
       
       // If this product falls under the free limit, set its base price to 0
       const actualBasePrice = (sortedIndex < freeLimit) ? 0 : prod.base_price
-      const itemTotal = actualBasePrice + moduleTotal
+      const itemTotal = (actualBasePrice + moduleTotal) * productQty
       subtotal += itemTotal
 
       items.push({
@@ -149,6 +151,7 @@ export function buildOrderSnapshot(
         product_name: prod.name + (actualBasePrice === 0 ? " (Inklusive/Frei)" : ""),
         base_price: actualBasePrice,
         billing_interval: prod.billing_interval,
+        quantity: productQty,
         selected_modules: selectedModules,
         item_total: itemTotal,
       })