feat(native-alarms): optional MesReportable column in the native-source override CSV import (ScadaBridge#102 item 4)

CLI import no longer has to reset MES overrides to inherit; a legacy 4-column file
still parses and the Central UI import keeps the stored flag for it.

Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV

tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/Components/InstanceConfigureNativeAlarmCsvImportTests.cs

@@ -84,6 +84,24 @@ public class InstanceConfigureNativeAlarmCsvImportTests
         Assert.Null(pump.Filter);
     }
 
+    /// <summary>Gitea #102: the MesReportable column flows through the import rows.</summary>
+    [Fact]
+    public void MesColumn_FlowsThroughToImportRows()
+    {
+        var csv = "SourceName,Connection,SourceReference,Filter,MesReportable\n"
+                + "BoilerAlarms,,,,true\n"
+                + "PumpAlarms,,,,\n";
+        var parsed = NativeAlarmSourceOverrideCsvParser.Parse(csv);
+
+        var outcome = InstanceConfigure.BuildNativeAlarmSourceCsvImport(parsed, Sources());
+
+        Assert.False(outcome.HasErrors);
+        Assert.True(outcome.Rows[0].HasMesColumn);
+        Assert.True(outcome.Rows[0].MesReportable);
+        Assert.True(outcome.Rows[1].HasMesColumn);
+        Assert.Null(outcome.Rows[1].MesReportable);
+    }
+
     /// <summary>Verifies that a row with all fields blank is marked as a clear.</summary>
     [Fact]
     public void AllBlankRow_IsMarkedAsClear()