981c410cb3
Replace the old sync logic (fetchers, merge configurations, bulk merge helper, post processors) with the new ETL pipeline factory. Changes: - Inject IEtlPipelineFactory instead of old dependencies - Remove IServiceProvider, IDbConnectionFactory, IBulkMergeHelper, IMergeConfigurationRegistry dependencies - Simplify ExecuteSyncCoreAsync to build and execute pipeline - Keep DataUpdateRepository calls for tracking sync timestamps - Determine SyncMode from UpdateType (Mass vs Incremental)