feat(transport): normalize List attribute values to native JSON on import

src/ZB.MOM.WW.ScadaBridge.Transport/Import/BundleImporter.cs

@@ -1040,7 +1040,7 @@ public sealed class BundleImporter : IBundleImporter
         {
             t.Attributes.Add(new TemplateAttribute(a.Name)
             {
-                Value = a.Value,
+                Value = ImportValueNormalizer.NormalizeListValue(a.Value, a.DataType, a.ElementDataType),
                 DataType = a.DataType,
                 IsLocked = a.IsLocked,
                 Description = a.Description,
@@ -1115,11 +1115,17 @@ public sealed class BundleImporter : IBundleImporter
         // Adds + Updates.
         foreach (var attrDto in dto.Attributes)
         {
+            // Normalise List values to the native-typed JSON form on import so the
+            // comparison (and the persisted value) match what the target already
+            // stores natively — otherwise an idempotent re-import of an old-form
+            // bundle would spuriously report a Value change.
+            var normalizedValue = ImportValueNormalizer.NormalizeListValue(
+                attrDto.Value, attrDto.DataType, attrDto.ElementDataType);
             if (existingByName.TryGetValue(attrDto.Name, out var current))
             {
                 // Update only if any field actually changed.
                 bool changed =
-                    !string.Equals(current.Value, attrDto.Value, StringComparison.Ordinal) ||
+                    !string.Equals(current.Value, normalizedValue, StringComparison.Ordinal) ||
                     current.DataType != attrDto.DataType ||
                     current.IsLocked != attrDto.IsLocked ||
                     !string.Equals(current.Description, attrDto.Description, StringComparison.Ordinal) ||
@@ -1127,7 +1133,7 @@ public sealed class BundleImporter : IBundleImporter
                     current.ElementDataType != attrDto.ElementDataType;
                 if (!changed) continue;
 
-                current.Value = attrDto.Value;
+                current.Value = normalizedValue;
                 current.DataType = attrDto.DataType;
                 current.IsLocked = attrDto.IsLocked;
                 current.Description = attrDto.Description;
@@ -1157,7 +1163,7 @@ public sealed class BundleImporter : IBundleImporter
             {
                 var newAttr = new TemplateAttribute(attrDto.Name)
                 {
-                    Value = attrDto.Value,
+                    Value = normalizedValue,
                     DataType = attrDto.DataType,
                     IsLocked = attrDto.IsLocked,
                     Description = attrDto.Description,