feat(options): eager startup validation for Communication + DataConnectionLayer options (arch-review 08 §1.5)

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj

src/ZB.MOM.WW.ScadaBridge.DataConnectionLayer/ServiceCollectionExtensions.cs

@@ -1,4 +1,6 @@
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using Microsoft.Extensions.Options;
 
 namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer;
 
@@ -13,8 +15,14 @@ public static class ServiceCollectionExtensions
     public static IServiceCollection AddDataConnectionLayer(this IServiceCollection services)
     {
         services.AddOptions<DataConnectionOptions>()
-            .BindConfiguration("DataConnectionLayer");
+            .BindConfiguration("DataConnectionLayer")
+            .ValidateOnStart();
+        services.TryAddEnumerable(
+            ServiceDescriptor.Singleton<IValidateOptions<DataConnectionOptions>, DataConnectionOptionsValidator>());
 
+        // OpcUaGlobalOptions / MxGatewayGlobalOptions carry only string identity/path
+        // fields (no numeric or duration knobs), so there is nothing to range-validate
+        // — no dedicated validator is registered for them.
         services.AddOptions<OpcUaGlobalOptions>()
             .BindConfiguration("OpcUa");