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/Services/Models/OfflineKitModels.cs

@@ -0,0 +1,111 @@
+using System;
+using System.Collections.Generic;
+
+namespace StellaOps.Cli.Services.Models;
+
+internal sealed record OfflineKitBundleDescriptor(
+    string BundleId,
+    string BundleName,
+    string BundleSha256,
+    long BundleSize,
+    Uri BundleDownloadUri,
+    string ManifestName,
+    string ManifestSha256,
+    Uri ManifestDownloadUri,
+    DateTimeOffset CapturedAt,
+    string? Channel,
+    string? Kind,
+    bool IsDelta,
+    string? BaseBundleId,
+    string? BundleSignatureName,
+    Uri? BundleSignatureDownloadUri,
+    string? ManifestSignatureName,
+    Uri? ManifestSignatureDownloadUri,
+    long? ManifestSize);
+
+internal sealed record OfflineKitDownloadResult(
+    OfflineKitBundleDescriptor Descriptor,
+    string BundlePath,
+    string ManifestPath,
+    string? BundleSignaturePath,
+    string? ManifestSignaturePath,
+    string MetadataPath,
+    bool FromCache);
+
+internal sealed record OfflineKitImportRequest(
+    string BundlePath,
+    string? ManifestPath,
+    string? BundleSignaturePath,
+    string? ManifestSignaturePath,
+    string? BundleId,
+    string? BundleSha256,
+    long? BundleSize,
+    DateTimeOffset? CapturedAt,
+    string? Channel,
+    string? Kind,
+    bool? IsDelta,
+    string? BaseBundleId,
+    string? ManifestSha256,
+    long? ManifestSize);
+
+internal sealed record OfflineKitImportResult(
+    string? ImportId,
+    string? Status,
+    DateTimeOffset SubmittedAt,
+    string? Message);
+
+internal sealed record OfflineKitStatus(
+    string? BundleId,
+    string? Channel,
+    string? Kind,
+    bool IsDelta,
+    string? BaseBundleId,
+    DateTimeOffset? CapturedAt,
+    DateTimeOffset? ImportedAt,
+    string? BundleSha256,
+    long? BundleSize,
+    IReadOnlyList<OfflineKitComponentStatus> Components);
+
+internal sealed record OfflineKitComponentStatus(
+    string Name,
+    string? Version,
+    string? Digest,
+    DateTimeOffset? CapturedAt,
+    long? SizeBytes);
+
+internal sealed record OfflineKitMetadataDocument
+{
+    public string? BundleId { get; init; }
+
+    public string BundleName { get; init; } = string.Empty;
+
+    public string BundleSha256 { get; init; } = string.Empty;
+
+    public long BundleSize { get; init; }
+
+    public string BundlePath { get; init; } = string.Empty;
+
+    public DateTimeOffset CapturedAt { get; init; }
+
+    public DateTimeOffset DownloadedAt { get; init; }
+
+    public string? Channel { get; init; }
+
+    public string? Kind { get; init; }
+
+    public bool IsDelta { get; init; }
+
+    public string? BaseBundleId { get; init; }
+
+    public string ManifestName { get; init; } = string.Empty;
+
+    public string ManifestSha256 { get; init; } = string.Empty;
+
+    public long? ManifestSize { get; init; }
+
+    public string ManifestPath { get; init; } = string.Empty;
+
+    public string? BundleSignaturePath { get; init; }
+
+    public string? ManifestSignaturePath { get; init; }
+}