perf(runtime): O(1) attribute resolution, precomputed types, coalesced static writes, shared JSON options

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

@@ -17,6 +17,15 @@ public static class ManagementEndpoints
 {
     private static readonly TimeSpan DefaultAskTimeout = TimeSpan.FromSeconds(30);
 
+    /// <summary>
+    /// Shared options for the per-request command payload JSON parse in
+    /// <see cref="ParseCommand"/> (perf remediation, arch-review WP1.5) — avoids
+    /// allocating a new <see cref="JsonSerializerOptions"/> per inbound management
+    /// request. Settings preserved exactly.
+    /// </summary>
+    private static readonly JsonSerializerOptions CommandPayloadJsonOptions =
+        new() { PropertyNameCaseInsensitive = true };
+
     /// <summary>
     /// Resolves the ManagementActor Ask timeout from configuration.
     /// Falls back to <see cref="DefaultAskTimeout"/>
@@ -197,7 +206,7 @@ public static class ManagementEndpoints
                 ? p.GetRawText()
                 : "{}";
             var command = JsonSerializer.Deserialize(payloadJson, commandType,
-                new JsonSerializerOptions { PropertyNameCaseInsensitive = true })!;
+                CommandPayloadJsonOptions)!;
             return CommandParseResult.Ok(command);
         }
         catch (Exception ex)