Projektdateien hinzufügen.

Webshop.Domain/Interfaces/IProductRepository.cs

@@ -0,0 +1,14 @@
+// src/Webshop.Domain/Interfaces/IProductRepository.cs
+using Webshop.Domain.Entities;
+
+namespace Webshop.Domain.Interfaces
+{
+    public interface IProductRepository
+    {
+        Task<Product?> GetProductByIdAsync(Guid id);
+        Task<IEnumerable<Product>> GetAllProductsAsync();
+        Task AddProductAsync(Product product);
+        Task UpdateProductAsync(Product product);
+        Task DeleteProductAsync(Guid id);
+    }
+}