feat: Initialize Zastava Webhook service with TLS and Authority authentication

- Added Program.cs to set up the web application with Serilog for logging, health check endpoints, and a placeholder admission endpoint.
- Configured Kestrel server to use TLS 1.3 and handle client certificates appropriately.
- Created StellaOps.Zastava.Webhook.csproj with necessary dependencies including Serilog and Polly.
- Documented tasks in TASKS.md for the Zastava Webhook project, outlining current work and exit criteria for each task.

src/StellaOps.Excititor.Connectors.Cisco.CSAF/CiscoCsafConnector.cs

@@ -129,10 +129,20 @@ public sealed class CiscoCsafConnector : VexConnectorBase
 
         if (stateChanged)
         {
-            var newState = new VexConnectorState(
+            var baseState = state ?? new VexConnectorState(
                 Descriptor.Id,
-                latestTimestamp == DateTimeOffset.MinValue ? state?.LastUpdated : latestTimestamp,
-                digestList.ToImmutableArray());
+                null,
+                ImmutableArray<string>.Empty,
+                ImmutableDictionary<string, string>.Empty,
+                null,
+                0,
+                null,
+                null);
+            var newState = baseState with
+            {
+                LastUpdated = latestTimestamp == DateTimeOffset.MinValue ? state?.LastUpdated : latestTimestamp,
+                DocumentDigests = digestList.ToImmutableArray(),
+            };
             await _stateRepository.SaveAsync(newState, cancellationToken).ConfigureAwait(false);
         }
     }