feat: add startup config validation and document ConfigManager pipeline editor

Add ConfigurationValidationRunner with IConfigurationValidator interface for
validating required settings at startup. Includes SecureStore and LDAP validators.
Expand ConfigManager with pipeline editing UI, dialogs, and step editors.
Update documentation with config validation guidance.

NEW/tests/JdeScoping.DataSync.Tests/Services/TableSyncOperationTests.cs

@@ -35,6 +35,7 @@ public class TableSyncOperationTests
                 Arg.Any<string>(),
                 Arg.Any<string>(),
                 Arg.Any<UpdateTypes>(),
+                Arg.Any<string?>(),
                 Arg.Any<CancellationToken>())
             .Returns(1);
 
@@ -274,6 +275,50 @@ public class TableSyncOperationTests
             Arg.Any<CancellationToken>());
     }
 
+    [Fact]
+    public async Task ExecuteAsync_PassesParametersJsonToStartUpdate()
+    {
+        // Arrange
+        var minDt = new DateTime(2024, 1, 15, 10, 30, 0, DateTimeKind.Utc);
+        var task = CreateTask("TestTable", UpdateTypes.Daily, minDt);
+        string? capturedParameters = null;
+
+        _updateRepository.StartUpdateAsync(
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<UpdateTypes>(),
+                Arg.Do<string?>(p => capturedParameters = p),
+                Arg.Any<CancellationToken>())
+            .Returns(1);
+
+        var testPipeline = CreateTestPipeline();
+
+        var mockBuilder = Substitute.For<IEtlPipelineBuilder>();
+        mockBuilder.WithUpdateType(Arg.Any<UpdateTypes>()).Returns(mockBuilder);
+        mockBuilder.WithMinimumDate(Arg.Any<DateTime?>()).Returns(mockBuilder);
+        mockBuilder.Build().Returns(testPipeline);
+
+        var mockFactory = Substitute.For<IEtlPipelineFactory>();
+        mockFactory.ForTable(Arg.Any<string>()).Returns(mockBuilder);
+
+        var sut = new TableSyncOperation(
+            mockFactory,
+            _updateRepository,
+            _options,
+            NullLogger<TableSyncOperation>.Instance,
+            _metrics);
+
+        // Act
+        await sut.ExecuteAsync(task);
+
+        // Assert
+        capturedParameters.ShouldNotBeNull();
+        capturedParameters.ShouldContain("OperationId");
+        capturedParameters.ShouldContain("MinimumDt");
+        capturedParameters.ShouldContain("2024-01-15");
+    }
+
     [Fact]
     public async Task ExecuteAsync_FailedPipeline_ThrowsAndCompletesUpdateAsFailure()
     {