feat: add category property to server type (#1150)

Related to
https://docs.hetzner.cloud/changelog#2025-08-25-category-for-server-types

Author: jooola

internal/cmd/servertype/describe.go

@@ -26,6 +26,7 @@ var DescribeCmd = base.DescribeCmd[*hcloud.ServerType]{
 		cmd.Printf("ID:\t\t\t%d\n", serverType.ID)
 		cmd.Printf("Name:\t\t\t%s\n", serverType.Name)
 		cmd.Printf("Description:\t\t%s\n", serverType.Description)
+		cmd.Printf("Category:\t\t%s\n", serverType.Category)
 		cmd.Printf("Cores:\t\t\t%d\n", serverType.Cores)
 		cmd.Printf("CPU Type:\t\t%s\n", serverType.CPUType)
 		cmd.Printf("Architecture:\t\t%s\n", serverType.Architecture)

internal/cmd/servertype/describe_test.go

@@ -25,6 +25,7 @@ func TestDescribe(t *testing.T) {
 			ID:          45,
 			Name:        "cax11",
 			Description: "CAX11",
+			Category:    "Shared vCPU",
 			Cores:       2,
 			CPUType:     hcloud.CPUTypeShared,
 			Memory:      4.0,
@@ -87,6 +88,7 @@ func TestDescribe(t *testing.T) {
 	expOut := `ID:			45
 Name:			cax11
 Description:		CAX11
+Category:		Shared vCPU
 Cores:			2
 CPU Type:		shared
 Architecture: