Close scratch iteration 009 grouped policy and VEX audit repairs

src/VexHub/StellaOps.VexHub.WebService/Models/VexApiModels.cs

@@ -32,9 +32,30 @@ public sealed class VexHubStats
     public required long TotalStatements { get; init; }
     public required long VerifiedStatements { get; init; }
     public required long FlaggedStatements { get; init; }
+    public required IReadOnlyDictionary<string, long> ByStatus { get; init; }
+    public required IReadOnlyDictionary<string, long> BySource { get; init; }
+    public required IReadOnlyList<VexHubActivityItem> RecentActivity { get; init; }
+    public required IReadOnlyList<VexHubTrendPoint> Trends { get; init; }
     public required DateTimeOffset GeneratedAt { get; init; }
 }
 
+public sealed class VexHubActivityItem
+{
+    public required Guid StatementId { get; init; }
+    public required string CveId { get; init; }
+    public required string Action { get; init; }
+    public required DateTimeOffset Timestamp { get; init; }
+}
+
+public sealed class VexHubTrendPoint
+{
+    public required DateOnly Date { get; init; }
+    public required int Affected { get; init; }
+    public required int NotAffected { get; init; }
+    public required int Fixed { get; init; }
+    public required int Investigating { get; init; }
+}
+
 /// <summary>
 /// VEX Hub index manifest for tool integration.
 /// </summary>