feat(deploy): fetch options + per-deployment token helper

src/ZB.MOM.WW.ScadaBridge.Communication/CommunicationOptions.cs

@@ -58,4 +58,17 @@ public class CommunicationOptions
 
     /// <summary>Akka.Remote transport failure detection threshold.</summary>
     public TimeSpan TransportFailureThreshold { get; set; } = TimeSpan.FromSeconds(15);
+
+    /// <summary>
+    /// Base URL (Traefik/LB) the SITE uses to fetch deploy configs from central,
+    /// e.g. "https://central.example:9000". Carried in RefreshDeploymentCommand so
+    /// sites need no new standing config. Empty disables notify-and-fetch fallback.
+    /// </summary>
+    public string CentralFetchBaseUrl { get; set; } = "";
+
+    /// <summary>
+    /// How long a staged PendingDeployment (and its fetch token) stays valid. Must
+    /// comfortably cover both site nodes' fetches within one deploy window.
+    /// </summary>
+    public TimeSpan PendingDeploymentTtl { get; set; } = TimeSpan.FromMinutes(5);
 }