Remove legacy ETL properties from DataSources configuration:
- FetcherTypeName (9 entries)
- PostProcessorTypeName (1 entry - MisData)
- PrepurgeData from MassConfig (9 entries)
- ReIndexData from MassConfig (9 entries)
These properties were used by the old fetcher-based ETL system
and are no longer needed with the new EtlPipeline architecture.
Move configuration options from Core/DataAccess/DataSync/ExcelIO to
dedicated Options folders within each project for better organization.
Update all references and tests accordingly.
Set up repository with legacy .NET Framework 4.8 source (OLD/),
new .NET 10 Blazor solution (NEW/), OpenSpec specifications,
documentation, and project configuration.