feat(centralui): Verify-endpoint button + result/cert panel (T17)

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Pages/Design/DataConnectionForm.razor

@@ -86,6 +86,9 @@
                                          IdPrefix="primary"
                                          Config="_primaryConfig"
                                          IsLegacy="_primaryIsLegacy"
+                                         SiteIdentifier="@_formSiteIdentifier"
+                                         ConnectionName="@_formName"
+                                         Protocol="@_protocol"
                                          Errors="_primaryErrors" />
                 }
 
@@ -118,6 +121,9 @@
                                              IdPrefix="backup"
                                              Config="_backupConfig"
                                              IsLegacy="_backupIsLegacy"
+                                             SiteIdentifier="@_formSiteIdentifier"
+                                             ConnectionName="@_formName"
+                                             Protocol="@_protocol"
                                              Errors="_backupErrors" />
                     }
                     <div class="mb-2">
@@ -170,6 +176,13 @@
     private ValidationResult? _backupErrors;
     private string? _formError;
 
+    // The machine-readable site identifier (used in Akka addresses) for the currently
+    // selected site — resolved from _formSiteId (the numeric primary key) so the
+    // endpoint editor's Verify probe can target the owning site. Blank until a site is
+    // chosen, which disables verification in the editor.
+    private string _formSiteIdentifier =>
+        _sites.FirstOrDefault(s => s.Id == _formSiteId)?.SiteIdentifier ?? string.Empty;
+
     protected override async Task OnInitializedAsync()
     {
         try