feat(ablegacy): Transport option selects native or libplctag across driver, probe and CLI

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy/AbLegacyDriverFactoryExtensions.cs

@@ -97,6 +97,8 @@ public static class AbLegacyDriverFactoryExtensions
                 ProbeAddress = dto.Probe?.ProbeAddress ?? "S:0",
             },
             Timeout = PositiveTimeoutOrDefault(dto.TimeoutMs, 2_000),
+            Transport = ParseEnum<AbLegacyTransport>(dto.Transport, driverInstanceId, "Transport",
+                fallback: AbLegacyTransport.Libplctag),
         };
 
         return options;
@@ -146,6 +148,11 @@ public static class AbLegacyDriverFactoryExtensions
         /// </summary>
         public int? TimeoutMs { get; init; }
 
+        /// <summary>
+        /// Gets or sets the transport (<c>Libplctag</c> or <c>Native</c>, case-insensitive); absent means Libplctag.
+        /// </summary>
+        public string? Transport { get; init; }
+
         /// <summary>
         /// Gets or sets the list of devices to connect to.
         /// </summary>