fix(logging): fail-closed bearer redaction; hoist per-request logger creation

src/ZB.MOM.WW.MxGateway.Server/Diagnostics/GatewayRequestLoggingMiddlewareExtensions.cs

@@ -24,12 +24,16 @@ public static class GatewayRequestLoggingMiddlewareExtensions
     {
         ArgumentNullException.ThrowIfNull(app);
 
+        // Resolved once at registration: the logger is keyed by category, not by request, so the
+        // per-request DI resolve and logger-factory lock bought nothing.
+        ILogger logger = app.ApplicationServices
+            .GetRequiredService<ILoggerFactory>()
+            .CreateLogger("MxGateway.Request");
+
         return app.Use(async (context, next) =>
         {
-            ILogger logger = context.RequestServices
-                .GetRequiredService<ILoggerFactory>()
-                .CreateLogger("MxGateway.Request");
-
+            // Scope construction is deliberately unconditional: gating it on IsEnabled would drop
+            // scope state for providers (and scope consumers) registered after startup.
             using IDisposable? scope = logger.BeginGatewayScope(new GatewayLogScope(
                 SessionId: ReadHeader(context, SessionIdHeaderName),
                 WorkerProcessId: ReadInt32Header(context, WorkerProcessIdHeaderName),