feat(configmanager): add runtime config validation using Infrastructure validators

Enable ConfigManager to validate runtime configuration (SecureStore secrets,
connection strings, LDAP) using the same validators as the Host application.
Adds AddInfrastructureValidators() extension for shared validator registration.

NEW/tests/JdeScoping.ConfigManager.Tests/ViewModels/MainWindowViewModelTests.cs

@@ -18,6 +18,7 @@ public class MainWindowViewModelTests
     private readonly IDialogService _dialogService;
     private readonly ISecureStoreManager _secureStoreManager;
     private readonly IClipboardService _clipboardService;
+    private readonly IRuntimeConfigValidationService _runtimeValidationService;
     private readonly ILogger<MainWindowViewModel> _logger;
 
     public MainWindowViewModelTests()
@@ -30,6 +31,7 @@ public class MainWindowViewModelTests
         _dialogService = Substitute.For<IDialogService>();
         _secureStoreManager = Substitute.For<ISecureStoreManager>();
         _clipboardService = Substitute.For<IClipboardService>();
+        _runtimeValidationService = Substitute.For<IRuntimeConfigValidationService>();
         _logger = Substitute.For<ILogger<MainWindowViewModel>>();
 
         _validationService.ValidateAppSettings(Arg.Any<ConfigModel>())
@@ -159,7 +161,7 @@ public class MainWindowViewModelTests
     }
 
     [Fact]
-    public void SelectingPipelineNode_LoadsPipelineFormViewModel()
+    public void SelectingPipelineNode_LoadsPipelineEditorViewModel()
     {
         // Arrange
         var config = new ConfigModel();
@@ -185,10 +187,10 @@ public class MainWindowViewModelTests
         sut.SelectedNode = pipelineNode;
 
         // Assert
-        sut.SelectedFormViewModel.ShouldBeOfType<PipelineFormViewModel>();
-        var pipelineForm = (PipelineFormViewModel)sut.SelectedFormViewModel!;
-        pipelineForm.Name.ShouldBe("WorkOrders");
-        pipelineForm.Connection.ShouldBe("jde");
+        sut.SelectedFormViewModel.ShouldBeOfType<PipelineEditorViewModel>();
+        var pipelineEditor = (PipelineEditorViewModel)sut.SelectedFormViewModel!;
+        pipelineEditor.Name.ShouldBe("WorkOrders");
+        pipelineEditor.Source.Connection.ShouldBe("jde");
     }
 
     [Fact]
@@ -318,6 +320,7 @@ public class MainWindowViewModelTests
             _dialogService,
             _secureStoreManager,
             _clipboardService,
+            _runtimeValidationService,
             _logger);
     }
 }