deprecate(lmxproxy): move all LmxProxy code, tests, and docs to deprecated/

LmxProxy is no longer needed. Moved the entire lmxproxy/ workspace, DCL
adapter files, and related docs to deprecated/. Removed LmxProxy registration
from DataConnectionFactory, project reference from DCL, protocol option from
UI, and cleaned up all requirement docs.

deprecated/lmxproxy/src-reference/ZB.MOM.WW.LmxProxy.Client/ILmxProxyClient.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using ZB.MOM.WW.LmxProxy.Client.Domain;
+
+namespace ZB.MOM.WW.LmxProxy.Client
+{
+    /// <summary>
+    /// Interface for LmxProxy client operations
+    /// </summary>
+    public interface ILmxProxyClient : IDisposable, IAsyncDisposable
+    {
+        /// <summary>
+        /// Gets or sets the default timeout for operations
+        /// </summary>
+        TimeSpan DefaultTimeout { get; set; }
+
+        /// <summary>
+        /// Connects to the LmxProxy service
+        /// </summary>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        Task ConnectAsync(CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// Disconnects from the LmxProxy service
+        /// </summary>
+        Task DisconnectAsync();
+
+        /// <summary>
+        /// Checks if the client is connected to the service
+        /// </summary>
+        Task<bool> IsConnectedAsync();
+
+        /// <summary>
+        /// Reads a single tag value
+        /// </summary>
+        /// <param name="address">The tag address to read.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        Task<Vtq> ReadAsync(string address, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// Reads multiple tag values in a single batch
+        /// </summary>
+        /// <param name="addresses">The tag addresses to read.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        Task<IDictionary<string, Vtq>> ReadBatchAsync(IEnumerable<string> addresses, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// Writes a single tag value
+        /// </summary>
+        /// <param name="address">The tag address to write.</param>
+        /// <param name="value">The value to write.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        Task WriteAsync(string address, object value, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// Writes multiple tag values in a single batch
+        /// </summary>
+        /// <param name="values">The tag addresses and values to write.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        Task WriteBatchAsync(IDictionary<string, object> values, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// Subscribes to tag updates
+        /// </summary>
+        /// <param name="addresses">The tag addresses to subscribe to.</param>
+        /// <param name="onUpdate">Callback invoked when tag values change.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        Task<ISubscription> SubscribeAsync(IEnumerable<string> addresses, Action<string, Vtq> onUpdate, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// Gets the current metrics snapshot
+        /// </summary>
+        Dictionary<string, object> GetMetrics();
+    }
+}