Significantly refactored `EnvelopeController.cs` to improve structure, add logging, and enhance error handling in methods. Introduced new private fields and updated constructor parameters, with some marked as obsolete.
Updated `EnvelopeOldService.cs` to add private fields, improve logging, and enhance error handling in key methods. Introduced `ReceiverAlreadySigned` method and marked `GetDocument` as obsolete. Improved overall functionality and maintainability.
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