feat: add audited one-shot prepare gate

tests/MBN_STOCK_WEBVIEW.Infrastructure.Tests/DatabaseMutationAuthorizationTestDoubles.cs

@@ -0,0 +1,15 @@
+#nullable enable
+
+namespace MBN_STOCK_WEBVIEW.Infrastructure.Tests;
+
+internal sealed class DenyAllDatabaseMutationAuthorization
+    : IDatabaseMutationAuthorization
+{
+    internal List<DatabaseMutationAuthorizationRequest> Requests { get; } = [];
+
+    public bool IsAuthorized(DatabaseMutationAuthorizationRequest request)
+    {
+        Requests.Add(request);
+        return false;
+    }
+}