feat(adminui): DriverTagPicker modal + 9 static address builders

- DriverTagPicker shell: modal chrome + per-driver picker body
  rendered as ChildContent.
- 9 picker bodies (Modbus/AbCip/AbLegacy/S7/TwinCat/FOCAS/
  OpcUaClient/Galaxy/Historian.Wonderware). 5 have computed
  builder logic + unit tests; 4 are free-text passthroughs
  (live browse for OPC UA + Galaxy is a documented follow-up).
- Each typed driver page gets a "Pick address" button that opens
  the modal with the matching body. Picked address surfaces in
  the modal footer for manual copy — no JS interop in v1.

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/Clusters/Drivers/ModbusDriverPage.razor

@@ -5,6 +5,7 @@
 @using Microsoft.EntityFrameworkCore
 @using ZB.MOM.WW.OtOpcUa.AdminUI.Clients
 @using ZB.MOM.WW.OtOpcUa.AdminUI.Components.Shared.Drivers
+@using ZB.MOM.WW.OtOpcUa.AdminUI.Components.Shared.Drivers.Pickers
 @using ZB.MOM.WW.OtOpcUa.Configuration
 @using ZB.MOM.WW.OtOpcUa.Configuration.Entities
 @using ZB.MOM.WW.OtOpcUa.Driver.Modbus
@@ -46,8 +47,20 @@ else
                 <DriverTestConnectButton DriverType="@DriverTypeKey"
                                          GetConfigJson="@SerializeCurrentConfig"
                                          TimeoutSeconds="@_form.AdminProbeTimeoutSeconds" />
+                <button type="button" class="btn btn-sm btn-outline-secondary mt-2"
+                        @onclick="@(() => _showPicker = true)">
+                    Pick address
+                </button>
             </div>
 
+            <DriverTagPicker @bind-Visible="_showPicker"
+                             Title="Modbus address"
+                             CurrentAddress="@_pickedAddress"
+                             OnPickAddress="@OnAddressPicked">
+                <ModbusAddressPickerBody CurrentAddress="@_pickedAddress"
+                                         CurrentAddressChanged="@((s) => _pickedAddress = s)" />
+            </DriverTagPicker>
+
             @* Transport *@
             <section class="panel rise mt-3" style="animation-delay:.06s">
                 <div class="panel-head">Transport</div>
@@ -298,6 +311,13 @@ else
     private bool _loaded;
     private bool _busy;
     private string? _error;
+
+    // Address picker state
+    private bool _showPicker;
+    private string _pickedAddress = "";
+
+    private void OnAddressPicked(string address) => _pickedAddress = address;
+
     // Held separately because Tags is a collection — rendered as read-only JSON.
     private IReadOnlyList<ModbusTagDefinition> _tags = [];
     private string _tagsJson = "[]";