Add tests and implement StubBearer authentication for Signer endpoints

- Created SignerEndpointsTests to validate the SignDsse and VerifyReferrers endpoints.
- Implemented StubBearerAuthenticationDefaults and StubBearerAuthenticationHandler for token-based authentication.
- Developed ConcelierExporterClient for managing Trivy DB settings and export operations.
- Added TrivyDbSettingsPageComponent for UI interactions with Trivy DB settings, including form handling and export triggering.
- Implemented styles and HTML structure for Trivy DB settings page.
- Created NotifySmokeCheck tool for validating Redis event streams and Notify deliveries.

src/StellaOps.Cli/Configuration/CliBootstrapper.cs

@@ -200,6 +200,40 @@ public static class CliBootstrapper
                 {
                     authority.TokenCacheDirectory = Path.GetFullPath(authority.TokenCacheDirectory);
                 }
+
+                cliOptions.Offline ??= new StellaOpsCliOfflineOptions();
+                var offline = cliOptions.Offline;
+
+                var kitsDirectory = ResolveWithFallback(
+                    string.Empty,
+                    configuration,
+                    "STELLAOPS_OFFLINE_KITS_DIRECTORY",
+                    "STELLAOPS_OFFLINE_KITS_DIR",
+                    "StellaOps:Offline:KitsDirectory",
+                    "StellaOps:Offline:KitDirectory",
+                    "Offline:KitsDirectory",
+                    "Offline:KitDirectory");
+
+                if (string.IsNullOrWhiteSpace(kitsDirectory))
+                {
+                    kitsDirectory = offline.KitsDirectory ?? "offline-kits";
+                }
+
+                offline.KitsDirectory = Path.GetFullPath(kitsDirectory);
+                if (!Directory.Exists(offline.KitsDirectory))
+                {
+                    Directory.CreateDirectory(offline.KitsDirectory);
+                }
+
+                var mirror = ResolveWithFallback(
+                    string.Empty,
+                    configuration,
+                    "STELLAOPS_OFFLINE_MIRROR_URL",
+                    "StellaOps:Offline:KitMirror",
+                    "Offline:KitMirror",
+                    "Offline:MirrorUrl");
+
+                offline.MirrorUrl = string.IsNullOrWhiteSpace(mirror) ? null : mirror.Trim();
             };
         });
 

src/StellaOps.Cli/Configuration/StellaOpsCliOptions.cs

@@ -9,7 +9,7 @@ public sealed class StellaOpsCliOptions
     public string ApiKey { get; set; } = string.Empty;
 
     public string BackendUrl { get; set; } = string.Empty;
-
+
     public string ScannerCacheDirectory { get; set; } = "scanners";
 
     public string ResultsDirectory { get; set; } = "results";
@@ -23,6 +23,8 @@ public sealed class StellaOpsCliOptions
     public int ScanUploadAttempts { get; set; } = 3;
 
     public StellaOpsCliAuthorityOptions Authority { get; set; } = new();
+
+    public StellaOpsCliOfflineOptions Offline { get; set; } = new();
 }
 
 public sealed class StellaOpsCliAuthorityOptions
@@ -54,3 +56,10 @@ public sealed class StellaOpsCliAuthorityResilienceOptions
 
     public TimeSpan? OfflineCacheTolerance { get; set; }
 }
+
+public sealed class StellaOpsCliOfflineOptions
+{
+    public string KitsDirectory { get; set; } = "offline-kits";
+
+    public string? MirrorUrl { get; set; }
+}