Introduced the `EndpointAuth` class in the `ReC.Domain.Entities` namespace to represent the `TBREC_CFG_ENDPOINT_AUTH` database table.
- Added Entity Framework annotations for table and column mappings.
- Defined properties for all table columns, including `Id`, `Active`, `Description`, `Type`, `ApiKey`, `ApiValue`, `ApiKeyAddTo`, `Token`, `Username`, `Password`, `Domain`, `Workstation`, `AddedWho`, `AddedWhen`, `ChangedWho`, and `ChangedWhen`.
- Configured `Id` as the primary key with auto-generated values.
