Add Get queries for variants and categories

src/Printbase.WebApi/Controllers/ProductVariantsController.cs

@@ -0,0 +1,30 @@
+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+using Printbase.Application.Products.Commands;
+using Printbase.Application.Products.Dtos;
+
+namespace Printbase.WebApi.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+public class ProductVariantsController(IMediator mediator) : ControllerBase
+{
+    [HttpPost]
+    public async Task<ActionResult<ProductVariantDto>> CreateProductVariant([FromBody] CreateProductVariantCommand command)
+    {
+        var result = await mediator.Send(command);
+        return CreatedAtAction(nameof(CreateProductVariant), new { id = result.Id }, result);
+    }
+
+    [HttpDelete("{id}")]
+    public async Task<ActionResult> DeleteProductVariant(Guid id)
+    {
+        var command = new DeleteProductVariantCommand { Id = id };
+        var result = await mediator.Send(command);
+        
+        if (!result)
+            return NotFound();
+            
+        return NoContent();
+    }
+}