Remove 9 unused types from Core (duplicate extension classes, TableSpec, ColumnSpec, LotLocation), move ComponentLotViewModel and OperatorViewModel from Client to Core, and refactor DataSync.Dev to use pipeline-based configuration. Fix Login.razor to use UserInfoDto directly.
- SearchRepository: Search table operations with Dapper
- SearchExecutionService: Search pipeline with proper cancellation handling
- WorkProcessor: Unified BackgroundService for syncs and searches
- SearchNotificationService: SignalR notifications in Api layer
All 45 new tests pass. Proper shutdown vs timeout distinction
prevents marking searches as error on host shutdown.