feat(management): IsMesReportable on alarm commands, IsMesReportableOverride on SetInstanceAlarmOverride

Claude-Session: https://claude.ai/code/session_01Y5ef34iUUMjmwnMpL9xgmB

src/ZB.MOM.WW.ScadaBridge.Commons/Messages/Management/InstanceCommands.cs

@@ -34,13 +34,23 @@ public record SetInstanceAreaCommand(int InstanceId, int? AreaId);
 /// Sets (or upserts) a per-instance alarm override. For HiLo trigger types the
 /// <c>TriggerConfigurationOverride</c> JSON is merged setpoint-by-setpoint with
 /// the inherited config; for binary trigger types it replaces the whole config.
-/// Either field is optional — pass null to leave it unchanged.
+/// Each override field is optional — null means the instance inherits the template value
+/// for that field (the row is replaced whole on every call, not merged).
 /// </summary>
+/// <param name="InstanceId">ID of the instance the override applies to.</param>
+/// <param name="AlarmCanonicalName">Canonical (path-qualified for composed members) alarm name.</param>
+/// <param name="TriggerConfigurationOverride">Trigger configuration JSON override, or null.</param>
+/// <param name="PriorityLevelOverride">Priority level override, or null.</param>
+/// <param name="IsMesReportableOverride">
+/// Per-instance override of the template alarm's MES-reportable flag. Additive trailing
+/// optional; null (the default) inherits the template value, true/false forces it.
+/// </param>
 public record SetInstanceAlarmOverrideCommand(
     int InstanceId,
     string AlarmCanonicalName,
     string? TriggerConfigurationOverride,
-    int? PriorityLevelOverride);
+    int? PriorityLevelOverride,
+    bool? IsMesReportableOverride = null);
 
 public record DeleteInstanceAlarmOverrideCommand(
     int InstanceId,