Add MediatR commands/queries/handlers and DTOs

src/Printbase.Application/Products/Commands/CreateCategoryCommand.cs

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+using MediatR;
+using Printbase.Application.Products.Dtos;
+
+namespace Printbase.Application.Products.Commands;
+
+public class CreateCategoryCommand : IRequest<CategoryDto>
+{
+    public string Name { get; set; } = null!;
+    public string Description { get; set; } = null!;
+    public string? ImageUrl { get; set; }
+    public int SortOrder { get; set; }
+    public bool IsActive { get; set; } = true;
+    public Guid? ParentCategoryId { get; set; }
+}

src/Printbase.Application/Products/Commands/CreateProductCommand.cs

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+using MediatR;
+using Printbase.Application.Products.Dtos;
+
+namespace Printbase.Application.Products.Commands;
+
+public class CreateProductCommand : IRequest<ProductDto>
+{
+    public string Name { get; set; } = null!;
+    public string? Description { get; set; }
+    public decimal BasePrice { get; set; }
+    public bool IsCustomizable { get; set; }
+    public bool IsActive { get; set; } = true;
+    public string? ImageUrl { get; set; }
+    public Guid? CategoryId { get; set; }
+}

src/Printbase.Application/Products/Commands/CreateProductVariantCommand.cs

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+using MediatR;
+using Printbase.Application.Products.Dtos;
+
+namespace Printbase.Application.Products.Commands;
+
+public class CreateProductVariantCommand : IRequest<ProductVariantDto>
+{
+    public Guid ProductId { get; set; }
+    public string Size { get; set; } = null!;
+    public string? Color { get; set; }
+    public decimal Price { get; set; }
+    public string? ImageUrl { get; set; }
+    public string Sku { get; set; } = null!;
+    public int StockQuantity { get; set; }
+    public bool IsActive { get; set; } = true;
+}

src/Printbase.Application/Products/Commands/DeleteCategoryCommand.cs

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+using MediatR;
+
+namespace Printbase.Application.Products.Commands;
+
+public class DeleteCategoryCommand : IRequest<bool>
+{
+    public Guid Id { get; set; }
+}

src/Printbase.Application/Products/Commands/DeleteProductCommand.cs

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+using MediatR;
+
+namespace Printbase.Application.Products.Commands;
+
+public class DeleteProductCommand : IRequest<bool>
+{
+    public Guid Id { get; set; }
+}

src/Printbase.Application/Products/Commands/DeleteProductVariantCommand.cs

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+using MediatR;
+
+namespace Printbase.Application.Products.Commands;
+
+public class DeleteProductVariantCommand : IRequest<bool>
+{
+    public Guid Id { get; set; }
+}