feat(debugview): DV-3 DebugTreeNode model + attribute tree builder

Pure path-split composition forest from streamed AttributeValueChanged: branch dedupe by accumulated prefix, ordinal child sort, post-order bad-quality roll-up, case-insensitive name-contains filter (keeps ancestors). BuildAlarmTree left as a NotImplementedException stub for DV-4. 16 unit tests cover structure + roll-up + filter.

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Pages/Deployment/DebugTreeNode.cs

@@ -0,0 +1,35 @@
+using ZB.MOM.WW.ScadaBridge.Commons.Messages.Streaming;
+using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums; // AlarmState
+
+namespace ZB.MOM.WW.ScadaBridge.CentralUI.Components.Pages.Deployment;
+
+/// <summary>
+/// A node in a Debug View composition tree. Attribute (and, in DV-4, alarm)
+/// names are path-qualified canonical names (e.g. <c>Motor1.Compressor.Pump</c>);
+/// the tree is derived by splitting those names on <c>'.'</c>. A node is either a
+/// branch (composition member, no payload, has children) or a leaf (one attribute
+/// or one alarm). Consumed by the generic <c>TreeView&lt;TItem&gt;</c> component.
+/// </summary>
+public sealed class DebugTreeNode
+{
+    /// <summary>Full canonical path — stable TreeView key.</summary>
+    public required string Key { get; init; }
+
+    /// <summary>Display label (the last path segment).</summary>
+    public required string Segment { get; init; }
+
+    public List<DebugTreeNode> Children { get; } = new();
+
+    // Leaf payloads — exactly one is set on a leaf; both null on a pure branch.
+    public AttributeValueChanged? Attribute { get; init; }
+    public AlarmStateChanged? Alarm { get; init; }   // computed leaf, native condition, or placeholder (DV-4)
+
+    public bool IsNativeBinding { get; init; }       // branch grouping native conditions (DV-4)
+
+    // Roll-up (set by the builder for branch nodes).
+    public AlarmState WorstState { get; set; } = AlarmState.Normal;
+    public int ActiveCount { get; set; }
+    public bool HasBadQuality { get; set; }
+
+    public bool HasChildren => Children.Count > 0;
+}