feat(site-runtime): wire ConfigFetchRetryCount into the standby replicated-config fetch (UA2)

src/ZB.MOM.WW.ScadaBridge.SiteRuntime/SiteRuntimeOptions.cs

@@ -61,8 +61,9 @@ public class SiteRuntimeOptions
     public int ConfigFetchTimeoutSeconds { get; set; } = 30;
 
     /// <summary>
-    /// Bounded retry count for the standby's best-effort replicated-config fetch.
-    /// Reserved — consumed by the standby replication fetch in a later task; not yet wired.
+    /// Bounded attempt count (including the first) for the standby's replicated-config
+    /// fetch; a 2 s fixed delay separates attempts and superseded fetches never retry.
+    /// Consumed by <c>SiteReplicationActor.HandleApplyConfigDeploy</c> (UA2). Default: 3.
     /// </summary>
     public int ConfigFetchRetryCount { get; set; } = 3;