fix(template-engine): DiffService covers native alarm sources — Deployments diff view no longer blind to native-alarm edits

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj

src/ZB.MOM.WW.ScadaBridge.TemplateEngine/Flattening/DiffService.cs

@@ -4,7 +4,8 @@ namespace ZB.MOM.WW.ScadaBridge.TemplateEngine.Flattening;
 
 /// <summary>
 /// Compares two FlattenedConfigurations (deployed vs current) and produces a ConfigurationDiff
-/// showing Added, Removed, and Changed entries for attributes, alarms, and scripts.
+/// showing Added, Removed, and Changed entries for attributes, alarms, scripts,
+/// and native alarm sources.
 /// </summary>
 public class DiffService
 {
@@ -42,6 +43,12 @@ public class DiffService
             s => s.CanonicalName,
             ScriptsEqual);
 
+        var nativeAlarmSourceChanges = ComputeEntityDiff(
+            oldConfig?.NativeAlarmSources ?? [],
+            newConfig.NativeAlarmSources,
+            n => n.CanonicalName,
+            NativeAlarmSourcesEqual);
+
         // Surface standalone connection endpoint/protocol/
         // failover drift. Per-attribute binding changes already show up under
         // AttributeChanges, but a connection's own ConfigurationJson /
@@ -57,6 +64,7 @@ public class DiffService
             AttributeChanges = attributeChanges,
             AlarmChanges = alarmChanges,
             ScriptChanges = scriptChanges,
+            NativeAlarmSourceChanges = nativeAlarmSourceChanges,
             ConnectionChanges = connectionChanges
         };
     }
@@ -138,6 +146,13 @@ public class DiffService
         a.TriggerConfiguration == b.TriggerConfiguration &&
         a.OnTriggerScriptCanonicalName == b.OnTriggerScriptCanonicalName;
 
+    private static bool NativeAlarmSourcesEqual(ResolvedNativeAlarmSource a, ResolvedNativeAlarmSource b) =>
+        a.CanonicalName == b.CanonicalName &&
+        a.ConnectionName == b.ConnectionName &&
+        a.SourceReference == b.SourceReference &&
+        a.ConditionFilter == b.ConditionFilter &&
+        a.IsLocked == b.IsLocked;
+
     private static bool ScriptsEqual(ResolvedScript a, ResolvedScript b) =>
         a.CanonicalName == b.CanonicalName &&
         a.Code == b.Code &&