Resolve all 46 low-severity architecture review findings

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

@@ -24,16 +24,18 @@ public static class ServiceCollectionExtensions
         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. Canonical sections are
-        // ScadaBridge:OpcUa / ScadaBridge:MxGateway (NF8): the bare "OpcUa"/"MxGateway"
-        // sections exist in no appsettings, so binding them read nothing.
+        // Validate identities before the first connection attempts to register with a server.
         services.AddOptions<OpcUaGlobalOptions>()
-            .BindConfiguration("ScadaBridge:OpcUa");
+            .BindConfiguration("ScadaBridge:OpcUa")
+            .ValidateOnStart();
+        services.TryAddEnumerable(
+            ServiceDescriptor.Singleton<IValidateOptions<OpcUaGlobalOptions>, OpcUaGlobalOptionsValidator>());
 
         services.AddOptions<MxGatewayGlobalOptions>()
-            .BindConfiguration("ScadaBridge:MxGateway");
+            .BindConfiguration("ScadaBridge:MxGateway")
+            .ValidateOnStart();
+        services.TryAddEnumerable(
+            ServiceDescriptor.Singleton<IValidateOptions<MxGatewayGlobalOptions>, MxGatewayGlobalOptionsValidator>());
 
         // Register the factory for protocol extensibility
         services.AddSingleton<IDataConnectionFactory, DataConnectionFactory>();