refactor: address code review findings across all projects

Apply comprehensive fixes from code reviews including:
- Extract shared utilities (SqlFormatHelper, CellValueConverter, DbDestinationBase)
- Add interface abstractions (IAuthenticationService, IDatabaseMigrator, IMisQueryBuilder)
- Implement SecureStore for encrypted secrets storage
- Fix error handling with proper HTTP status codes and logging
- Optimize double enumeration in DevEtlRegistry
- Add DataSync.Dev README for developer onboarding
- Extract filter panel base classes to reduce duplication
- Update code review docs to mark all issues as fixed

NEW/tests/JdeScoping.Infrastructure.Tests/Unit/FakeAuthServiceTests.cs

@@ -37,26 +37,4 @@ public class FakeAuthServiceTests
         result.ErrorMessage.ShouldBeNull();
     }
 
-    [Fact]
-    public async Task GetUserInfoAsync_ReturnsUserInfo()
-    {
-        // Act
-        var result = await _sut.GetUserInfoAsync("testuser");
-
-        // Assert
-        result.ShouldNotBeNull();
-        result.Username.ShouldBe("testuser");
-        result.FirstName.ShouldBe("Dev");
-        result.LastName.ShouldBe("User");
-    }
-
-    [Fact]
-    public async Task IsInGroupAsync_AlwaysReturnsTrue()
-    {
-        // Act
-        var result = await _sut.IsInGroupAsync("testuser", "AnyGroup");
-
-        // Assert
-        result.ShouldBeTrue();
-    }
 }