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/ZB.MOM.WW.LmxProxy.Client/ClientConfiguration.cs

@@ -0,0 +1,19 @@
+namespace ZB.MOM.WW.LmxProxy.Client;
+
+/// <summary>
+/// Configuration options for the LmxProxy client, typically set via the builder.
+/// </summary>
+internal class ClientConfiguration
+{
+    /// <summary>Maximum number of retry attempts for transient failures.</summary>
+    public int MaxRetryAttempts { get; set; }
+
+    /// <summary>Base delay between retries (exponential backoff applied).</summary>
+    public TimeSpan RetryDelay { get; set; }
+
+    /// <summary>Whether client-side metrics collection is enabled.</summary>
+    public bool EnableMetrics { get; set; }
+
+    /// <summary>Optional header name for correlation ID propagation.</summary>
+    public string? CorrelationIdHeader { get; set; }
+}