feat(dotnet-client): operator credentials on acknowledge-alarm

Claude-Session: https://claude.ai/code/session_016J6isfcgqy4SB2RK3ZvFvT

clients/dotnet/ZB.MOM.WW.MxGateway.Client.Tests/MxGatewayClientCliTests.cs

@@ -763,6 +763,7 @@ public sealed class MxGatewayClientCliTests
     [Fact]
     public async Task RunAsync_AcknowledgeAlarm_BuildsRequestAndPrintsJsonReply()
     {
+        Environment.SetEnvironmentVariable("MXGW_TEST_OPPW", "op-pw-secret");
         using var output = new StringWriter();
         using var error = new StringWriter();
         FakeCliClient fakeClient = new();
@@ -786,6 +787,10 @@ public sealed class MxGatewayClientCliTests
                 "ack from cli",
                 "--operator",
                 "operator1",
+                "--operator-domain",
+                "CORP",
+                "--operator-password-env",
+                "MXGW_TEST_OPPW",
                 "--json",
             ],
             output,
@@ -797,6 +802,9 @@ public sealed class MxGatewayClientCliTests
         Assert.Equal("Tank01.Level.HiHi", request.AlarmFullReference);
         Assert.Equal("ack from cli", request.Comment);
         Assert.Equal("operator1", request.OperatorUser);
+        Assert.Equal("CORP", request.OperatorDomain);
+        Assert.Equal("op-pw-secret", request.OperatorPassword);
+        Assert.DoesNotContain("op-pw-secret", output.ToString());
         Assert.Contains("ack-fixture", output.ToString());
         Assert.Equal(string.Empty, error.ToString());
     }