feat(lmxproxy): phase 1 — v2 protocol types and domain model

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lmxproxy/src-reference/ZB.MOM.WW.LmxProxy.Host/Domain/ClientStats.cs

@@ -0,0 +1,23 @@
+namespace ZB.MOM.WW.LmxProxy.Host.Domain
+{
+    /// <summary>
+    ///     Per-client subscription statistics.
+    /// </summary>
+    public class ClientStats
+    {
+        /// <summary>
+        ///     Gets or sets the number of tags the client is subscribed to.
+        /// </summary>
+        public int SubscribedTags { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the number of delivered messages.
+        /// </summary>
+        public long DeliveredMessages { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the number of dropped messages.
+        /// </summary>
+        public long DroppedMessages { get; set; }
+    }
+}