Add Layer SBOM endpoints and CLI command tests for integration

src/Scanner/StellaOps.Scanner.WebService/Endpoints/ScanEndpoints.cs

@@ -88,6 +88,7 @@ internal static class ScanEndpoints
         scans.MapEvidenceEndpoints();
         scans.MapApprovalEndpoints();
         scans.MapManifestEndpoints();
+        scans.MapLayerSbomEndpoints(); // Sprint: SPRINT_20260106_003_001
     }
 
     private static async Task<IResult> HandleSubmitAsync(

src/Scanner/StellaOps.Scanner.WebService/Program.cs

@@ -142,6 +142,7 @@ builder.Services.AddScoped<ICallGraphIngestionService, CallGraphIngestionService
 builder.Services.AddScoped<ISbomIngestionService, SbomIngestionService>();
 builder.Services.AddSingleton<ISbomUploadStore, InMemorySbomUploadStore>();
 builder.Services.AddScoped<ISbomByosUploadService, SbomByosUploadService>();
+builder.Services.AddSingleton<ILayerSbomService, LayerSbomService>(); // Sprint: SPRINT_20260106_003_001
 builder.Services.AddSingleton<IPolicySnapshotRepository, InMemoryPolicySnapshotRepository>();
 builder.Services.AddSingleton<IPolicyAuditRepository, InMemoryPolicyAuditRepository>();
 builder.Services.AddSingleton<PolicySnapshotStore>();