Replace entire repo content with shahikitchen-v1-prodcution.zip (v1.1 production)

domain/cart/repository.ts

@@ -0,0 +1,7 @@
+import type { CartItem } from './entities';
+
+/** Port: cart persistence (implemented by infrastructure). */
+export interface CartRepository {
+  load(): CartItem[];
+  save(items: CartItem[]): void;
+}