- Added `[NotMapped]` attribute to `HasAnyCriteria` in `ReceiverQueryBase` to exclude it from database mapping.
- Made `HasAnyCriteria` in `ReceiverQueryBase` virtual for overriding.
- Introduced `EmailAddressSearch` in `ReadReceiverQuery` for partial email matching.
- Overrode `HasAnyCriteria` in `ReadReceiverQuery` to include `EmailAddressSearch`.
- Updated `ReadReceiverQueryHandler` to support partial email matching using `EF.Functions.Like`.
Introduced a CQRS-style ReadReceiverQueryHandler using MediatR to enable flexible querying of receivers by Id, EmailAddress, or Signature. Integrated AutoMapper for DTO mapping and updated ReadReceiverQuery to support MediatR's request/response pipeline.