Supplier cost responses and address meaning have changed

productAddCosts, productUpdateCosts, and productArchiveCosts now run as a tracked process and return its processId. For productArchiveCosts, that value previously contained the product ID. Treat it as a process identifier and inspect failedItems for rejected products.

SupplySupplier.address now returns the ship-from address. Callers that need the remit-to address must select it explicitly. Dropship cost tiers now require a minimum order quantity of 1.