feat(commons): add IDriverBrowser/IBrowseSession/BrowseNode abstractions

src/Core/ZB.MOM.WW.OtOpcUa.Commons/Browsing/BrowseNode.cs

@@ -0,0 +1,32 @@
+namespace ZB.MOM.WW.OtOpcUa.Commons.Browsing;
+
+/// <summary>One node in a driver-agnostic browse tree.</summary>
+/// <param name="NodeId">Stable identifier passed back to the picker on commit. For OPC UA
+/// this is the <c>nsu=...;...</c> form; for Galaxy this is the <c>tag_name</c>.</param>
+/// <param name="DisplayName">Label shown in the tree.</param>
+/// <param name="Kind">Whether this node terminates the address (Leaf) or has children
+/// (Folder). Galaxy never returns Leaves; only the attribute side-panel terminates.</param>
+/// <param name="HasChildrenHint">When true, the UI renders an expand affordance before
+/// the children have been fetched.</param>
+public sealed record BrowseNode(
+    string NodeId,
+    string DisplayName,
+    BrowseNodeKind Kind,
+    bool HasChildrenHint);
+
+/// <summary>Discriminates terminal vs. expandable nodes for UI rendering.</summary>
+public enum BrowseNodeKind
+{
+    /// <summary>Expandable — has (or may have) children. UI shows expand affordance.</summary>
+    Folder,
+    /// <summary>Terminal — commit on select.</summary>
+    Leaf,
+}
+
+/// <summary>Metadata for an attribute of a Galaxy object (or the equivalent
+/// per-driver concept). Surfaced in the picker's attribute side-panel.</summary>
+public sealed record AttributeInfo(
+    string Name,
+    string DriverDataType,
+    bool   IsArray,
+    string SecurityClass);