Introduce MassData feature with new API endpoints for querying and upserting records by customer name. Add DTOs, AutoMapper profile, MediatR CQRS handlers, repository pattern, and MassDataDbContext. Register new services in DI and add MassDataConnection to configuration. Upsert uses stored procedure. Enables full CRUD for Massdata via dedicated API.
Replaced all usage of the Catalog entity with VwmyCatalog across application, domain, and infrastructure layers. Updated AutoMapper profiles, repository interfaces, and service logic to use VwmyCatalog. Removed the obsolete Catalog entity and related mapping profiles. Moved VwmyCatalog to the Domain.Entities namespace and cleaned up project structure. This change simplifies the domain model and eliminates redundant entity definitions.
