feat(native-alarms): per-binding IsMesReportable on native alarm source bindings (ScadaBridge#59)

TemplateNativeAlarmSource.IsMesReportable + tri-state InstanceNativeAlarmSourceOverride
.IsMesReportableOverride flatten onto ResolvedNativeAlarmSource; NativeAlarmActor stamps every
mirrored condition and InstanceActor the quiet-binding placeholder, so ScriptAlarm,
Alarms.MesReportableAsync() and the #60 wire fields carry it. Additive to the 900-999 severity band.
Migration AddNativeAlarmSourceMesReportable. Management commands, CLI --mes-reportable, Central UI
(template dialog checkbox, instance override select), Transport DTOs/importer/diff and the revision
hash (true-only, so existing hashes are unchanged) carry it.

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

tests/ZB.MOM.WW.ScadaBridge.SiteRuntime.Tests/Actors/InstanceActorNativeAlarmTests.cs

@@ -51,7 +51,7 @@ public class InstanceActorNativeAlarmTests : TestKit, IDisposable
             NullLogger<InstanceActor>.Instance,
             dclManager)));
 
-    private static FlattenedConfiguration ConfigWithNativeSource(string instanceName) => new()
+    private static FlattenedConfiguration ConfigWithNativeSource(string instanceName, bool mesReportable = false) => new()
     {
         InstanceUniqueName = instanceName,
         NativeAlarmSources =
@@ -60,7 +60,8 @@ public class InstanceActorNativeAlarmTests : TestKit, IDisposable
             {
                 CanonicalName = "Pressure",
                 ConnectionName = "Opc",
-                SourceReference = "ns=2;s=T01"
+                SourceReference = "ns=2;s=T01",
+                IsMesReportable = mesReportable
             }
         ]
     };
@@ -100,6 +101,22 @@ public class InstanceActorNativeAlarmTests : TestKit, IDisposable
             a.SourceReference == "T01.Hi" && a.Kind == AlarmKind.NativeOpcUa && a.Condition.Severity == 800);
     }
 
+    /// <summary>Gitea #59: the quiet-binding placeholder row carries the binding's MES flag.</summary>
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public void Snapshot_QuietNativeBinding_PlaceholderCarriesBindingMesFlag(bool flag)
+    {
+        var dcl = CreateTestProbe();
+        var actor = CreateInstanceActorWithDcl("inst", ConfigWithNativeSource("inst", flag), dcl.Ref);
+        dcl.ExpectMsg<SubscribeAlarmsRequest>();
+
+        actor.Tell(new SubscribeDebugViewRequest("inst", "c"));
+        var snap = ExpectMsg<DebugViewSnapshot>();
+
+        Assert.Equal(flag, Assert.Single(snap.AlarmStates, a => a.IsConfiguredPlaceholder).IsMesReportable);
+    }
+
     /// <summary>Verifies that a quiet native binding emits a placeholder in the snapshot.</summary>
     [Fact]
     public void Snapshot_QuietNativeBinding_EmitsPlaceholder()