Added `ReceiverService` to the dependency injection container in `Program.cs` and implemented its functionality for fetching receiver email suggestions via API.
Enhanced `DocumentService` with a new method `GetSenderDocumentDetailsByEnvelopeIdAsync` to fetch sender document details by envelope ID. Introduced JSON handling improvements with `JsonSerializerOptions`.
These changes improve support for receiver-related operations and extend document-related capabilities.
TekH
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