Refactor code structure and optimize performance across multiple modules

src/Registry/__Tests/StellaOps.Registry.TokenService.Tests/RegistryTokenIssuerTests.cs

@@ -5,13 +5,16 @@ using Microsoft.Extensions.Options;
 using StellaOps.Registry.TokenService;
 using StellaOps.Registry.TokenService.Observability;
 
+
+using StellaOps.TestKit;
 namespace StellaOps.Registry.TokenService.Tests;
 
 public sealed class RegistryTokenIssuerTests : IDisposable
 {
     private readonly List<string> _tempFiles = new();
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void IssueToken_GeneratesJwtWithAccessClaim()
     {
         var pemPath = CreatePemKey();