Implement UoW

src/Printbase.Application/IUnitOfWork.cs

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+using Printbase.Domain.Repositories;
+
+namespace Printbase.Application;
+
+public interface IUnitOfWork
+{
+    public IProductRepository ProductRepository { get; }
+    public ICategoryRepository CategoryRepository { get; }
+    public IProductVariantRepository ProductVariantRepository { get; }
+
+    Task SaveAsync();
+    Task BeginTransactionAsync();
+    Task CommitTransactionAsync();
+    Task RollbackTransactionAsync();
+}

src/Printbase.Infrastructure/UnitOfWork.cs

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+using Printbase.Application;
+using Printbase.Domain.Repositories;
+using Printbase.Infrastructure.Database;
+
+namespace Printbase.Infrastructure;
+
+public class UnitOfWork(
+    ApplicationDbContext context, 
+    IProductRepository productRepository, 
+    IProductVariantRepository productVariantRepository, 
+    ICategoryRepository categoryRepository) : IUnitOfWork
+{
+    public IProductRepository ProductRepository => productRepository;
+    public IProductVariantRepository ProductVariantRepository => productVariantRepository;
+    public ICategoryRepository CategoryRepository => categoryRepository;
+
+    public async Task SaveAsync()
+    {
+        await context.SaveChangesAsync();
+    }
+
+    public async Task BeginTransactionAsync()
+    {
+        await context.Database.BeginTransactionAsync();
+    }
+
+    public async Task CommitTransactionAsync()
+    {
+        await context.Database.CommitTransactionAsync();
+    }
+
+    public async Task RollbackTransactionAsync()
+    {
+        await context.Database.RollbackTransactionAsync();
+    }
+}