feat(m9/T23a): folder sibling reorder (ReorderFolderAsync + command + handler)

src/ZB.MOM.WW.ScadaBridge.Commons/Types/Enums/ReorderDirection.cs

@@ -0,0 +1,16 @@
+namespace ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
+
+/// <summary>
+/// Direction for a sibling reorder operation. Ordering is ascending by
+/// <c>SortOrder</c>, so <see cref="Up"/> moves an item toward a lower sort
+/// order (earlier in the list) and <see cref="Down"/> toward a higher sort
+/// order (later in the list).
+/// </summary>
+public enum ReorderDirection
+{
+    /// <summary>Move toward a lower sort order (swap with the previous sibling).</summary>
+    Up,
+
+    /// <summary>Move toward a higher sort order (swap with the next sibling).</summary>
+    Down
+}