perf(deploy): flatten-session caching, bulk DeploySiteAsync, paged management queries

src/ZB.MOM.WW.ScadaBridge.ManagementService/ManagementEndpoints.cs

@@ -42,6 +42,10 @@ public static class ManagementEndpoints
     [
         typeof(ImportBundleCommand), typeof(PreviewBundleCommand), typeof(ExportBundleCommand),
         typeof(MgmtDeployArtifactsCommand), typeof(MgmtDeployInstanceCommand),
+        // A bulk site deploy is by construction the longest command in the set —
+        // it is N instance deploys, so it must never inherit the ordinary Ask
+        // timeout or the caller would 504 while the batch is still applying.
+        typeof(MgmtDeploySiteCommand),
     ];
 
     /// <summary>