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/tests/ZB.MOM.WW.LmxProxy.Client.Tests/LmxProxyClientFactoryTests.cs

@@ -0,0 +1,51 @@
+using Microsoft.Extensions.Configuration;
+using Xunit;
+
+namespace ZB.MOM.WW.LmxProxy.Client.Tests;
+
+public class LmxProxyClientFactoryTests
+{
+    [Fact]
+    public void CreateClient_BindsFromConfiguration()
+    {
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["LmxProxy:Host"] = "10.100.0.48",
+                ["LmxProxy:Port"] = "50052",
+                ["LmxProxy:ApiKey"] = "test-key",
+                ["LmxProxy:Retry:MaxAttempts"] = "5",
+                ["LmxProxy:Retry:Delay"] = "00:00:02",
+            })
+            .Build();
+
+        var factory = new LmxProxyClientFactory(config);
+        var client = factory.CreateClient();
+        Assert.NotNull(client);
+    }
+
+    [Fact]
+    public void CreateClient_NamedSection()
+    {
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["MyProxy:Host"] = "10.100.0.48",
+                ["MyProxy:Port"] = "50052",
+            })
+            .Build();
+
+        var factory = new LmxProxyClientFactory(config);
+        var client = factory.CreateClient("MyProxy");
+        Assert.NotNull(client);
+    }
+
+    [Fact]
+    public void CreateClient_BuilderAction()
+    {
+        var config = new ConfigurationBuilder().Build();
+        var factory = new LmxProxyClientFactory(config);
+        var client = factory.CreateClient(b => b.WithHost("localhost").WithPort(50051));
+        Assert.NotNull(client);
+    }
+}