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/src/JdeScoping.DataSync.Dev/DevEtlRegistry.cs

@@ -79,10 +79,11 @@ public class DevEtlRegistry
         using var semaphore = new SemaphoreSlim(maxDegreeOfParallelism);
 
         // Separate tables by size - run very large ones sequentially at the end
-        var smallMediumTables = GetAvailableTables()
+        var allTables = GetAvailableTables().ToList();
+        var smallMediumTables = allTables
             .Where(t => !_pipelineFactory.IsVeryLargeTable(t))
             .ToList();
-        var veryLargeTables = GetAvailableTables()
+        var veryLargeTables = allTables
             .Where(t => _pipelineFactory.IsVeryLargeTable(t))
             .ToList();