Refactor code structure and optimize performance across multiple modules

src/Scanner/__Tests/StellaOps.Scanner.WebService.Tests/ScansEndpointsTests.Entropy.cs

@@ -9,7 +9,8 @@ namespace StellaOps.Scanner.WebService.Tests;
 
 public sealed partial class ScansEndpointsTests
 {
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task EntropyEndpoint_AttachesSnapshot_AndSurfacesInStatus()
     {
         using var secrets = new TestSurfaceSecretsScope();
@@ -21,6 +22,7 @@ public sealed partial class ScansEndpointsTests
 
         using var client = factory.CreateClient();
 
+using StellaOps.TestKit;
         var submitResponse = await client.PostAsJsonAsync("/api/v1/scans", new
         {
             image = new { digest = "sha256:image-demo" }