feat(drivers): expose ProbeTimeoutSeconds on every driver Options class

Adds a uniform [Range(1, 60)] ProbeTimeoutSeconds property to all 9
driver Options classes (Modbus 5s, AbCip 5s, AbLegacy 5s, S7 5s,
TwinCAT 10s, FOCAS 10s, OpcUaClient 15s, Galaxy 30s, Historian 15s).
Powers the AdminUI Test Connect button (Phase 7 of the plan).

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.Contracts/ModbusDriverOptions.cs

@@ -1,3 +1,5 @@
+using System.ComponentModel.DataAnnotations;
+
 namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus;
 
 /// <summary>
@@ -174,6 +176,14 @@ public sealed class ModbusDriverOptions
     ///     attempt; <see cref="ModbusReconnectOptions.MaxDelay"/> caps the geometric growth.
     /// </summary>
     public ModbusReconnectOptions Reconnect { get; init; } = new();
+
+    /// <summary>
+    ///     Timeout for the AdminUI Test Connect probe, in seconds. The AdminUI clamps to a
+    ///     60s server-side maximum; this default is what the form pre-fills for new instances.
+    /// </summary>
+    [Display(Name = "Probe timeout (seconds)", Description = "Connection test timeout. Default 5s.", GroupName = "Diagnostics")]
+    [Range(1, 60)]
+    public int ProbeTimeoutSeconds { get; init; } = 5;
 }
 
 /// <summary>OS-level TCP keep-alive knobs. Set <see cref="Enabled"/>=false to skip entirely.</summary>