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* Add Backends For Frontends pattern (#300) Implements the BFF pattern with two client-specific gateways (MobileBff, DesktopBff) aggregating shared downstream services (AuthService, CartService, OrderService, SupplierService) into client-tailored response shapes. Closes #300 * Rename SupplierService lookup key to productName for clarity The service is looked up by product name throughout the codebase, not an actual product ID as the previous naming implied. * Address review feedback: remove unnecessary compact constructors, add InMemory* service tests