feat(site): HTTP deployment-config fetcher + DI + options

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

@@ -56,4 +56,13 @@ public class SiteRuntimeOptions
     /// Default: 5000ms.
     /// </summary>
     public int NativeAlarmRetryIntervalMs { get; set; } = 5000;
+
+    /// <summary>HTTP timeout (seconds) for fetching a deployment config from central (notify-and-fetch).</summary>
+    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.
+    /// </summary>
+    public int ConfigFetchRetryCount { get; set; } = 3;
 }