feat(batch6-task4): implement f3 account authorization parsing

dotnet/src/ZB.MOM.NatsNet.Server/Accounts/Account.cs

@@ -407,6 +407,74 @@ public sealed class Account : INatsAccount
     /// </summary>
     private int _traceDestSampling;
 
+    /// <summary>
+    /// Sets account-level message trace destination subject.
+    /// Mirrors writes to Go <c>acc.traceDest</c> during config parsing.
+    /// </summary>
+    internal void SetMessageTraceDestination(string subject)
+    {
+        _mu.EnterWriteLock();
+        try
+        {
+            _traceDest = subject ?? string.Empty;
+        }
+        finally
+        {
+            _mu.ExitWriteLock();
+        }
+    }
+
+    /// <summary>
+    /// Returns account-level message trace destination subject.
+    /// Mirrors reads of Go <c>acc.traceDest</c> during config parsing.
+    /// </summary>
+    internal string GetMessageTraceDestination()
+    {
+        _mu.EnterReadLock();
+        try
+        {
+            return _traceDest;
+        }
+        finally
+        {
+            _mu.ExitReadLock();
+        }
+    }
+
+    /// <summary>
+    /// Sets account-level message trace sampling percentage.
+    /// Mirrors writes to Go <c>acc.traceDestSampling</c> during config parsing.
+    /// </summary>
+    internal void SetMessageTraceSampling(int sampling)
+    {
+        _mu.EnterWriteLock();
+        try
+        {
+            _traceDestSampling = sampling;
+        }
+        finally
+        {
+            _mu.ExitWriteLock();
+        }
+    }
+
+    /// <summary>
+    /// Returns account-level message trace sampling percentage.
+    /// Mirrors reads of Go <c>acc.traceDestSampling</c> during config parsing.
+    /// </summary>
+    internal int GetMessageTraceSampling()
+    {
+        _mu.EnterReadLock();
+        try
+        {
+            return _traceDestSampling;
+        }
+        finally
+        {
+            _mu.ExitReadLock();
+        }
+    }
+
     // -------------------------------------------------------------------------
     // Factory
     // -------------------------------------------------------------------------