Refactored the `EnvelopeController` to use C# 9's record syntax for dependency injection, directly injecting `ILogger<EnvelopeController>` and `IMediator` into the constructor. Removed private fields `_logger` and `_mediator`, replacing them with constructor-injected properties. Updated methods to use these properties for consistency. Moved `DeleteEnvelopeRequest` to a top-level class for better organization. Enhanced XML documentation for improved clarity.
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