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.Scanner.WebService/Contracts/RuntimePolicyContracts.cs

@@ -0,0 +1,75 @@
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+namespace StellaOps.Scanner.WebService.Contracts;
+
+public sealed record RuntimePolicyRequestDto
+{
+    [JsonPropertyName("namespace")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? Namespace { get; init; }
+
+    [JsonPropertyName("labels")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public IDictionary<string, string>? Labels { get; init; }
+
+    [JsonPropertyName("images")]
+    public IReadOnlyList<string> Images { get; init; } = Array.Empty<string>();
+}
+
+public sealed record RuntimePolicyResponseDto
+{
+    [JsonPropertyName("ttlSeconds")]
+    public int TtlSeconds { get; init; }
+
+    [JsonPropertyName("expiresAtUtc")]
+    public DateTimeOffset ExpiresAtUtc { get; init; }
+
+    [JsonPropertyName("policyRevision")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? PolicyRevision { get; init; }
+
+    [JsonPropertyName("results")]
+    public IReadOnlyDictionary<string, RuntimePolicyImageResponseDto> Results { get; init; } = new Dictionary<string, RuntimePolicyImageResponseDto>(StringComparer.Ordinal);
+}
+
+public sealed record RuntimePolicyImageResponseDto
+{
+    [JsonPropertyName("policyVerdict")]
+    public string PolicyVerdict { get; init; } = "unknown";
+
+    [JsonPropertyName("signed")]
+    public bool Signed { get; init; }
+
+    [JsonPropertyName("hasSbomReferrers")]
+    public bool HasSbomReferrers { get; init; }
+
+    [JsonPropertyName("hasSbom")]
+    public bool HasSbomLegacy { get; init; }
+
+    [JsonPropertyName("reasons")]
+    public IReadOnlyList<string> Reasons { get; init; } = Array.Empty<string>();
+
+    [JsonPropertyName("rekor")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public RuntimePolicyRekorDto? Rekor { get; init; }
+
+    [JsonPropertyName("metadata")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public IDictionary<string, object?>? Metadata { get; init; }
+}
+
+public sealed record RuntimePolicyRekorDto
+{
+    [JsonPropertyName("uuid")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? Uuid { get; init; }
+
+    [JsonPropertyName("url")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? Url { get; init; }
+
+    [JsonPropertyName("verified")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public bool? Verified { get; init; }
+}