Add DocResult property and update EnvelopeController

- Introduced a new `DocResult` property in `EnvelopeDto.cs` and `Envelope.cs` for handling binary data.
- Rearranged properties in `EnvelopeDto.cs` for better organization.
- Modified `EnvelopeController` to return a collection of envelopes instead of a single envelope.

EnvelopeGenerator.Application/DTOs/EnvelopeDto.cs

@@ -66,6 +66,9 @@ namespace EnvelopeGenerator.Application.DTOs
 		public string? StatusTranslated { get; set; }
 
 		public string? ContractTypeTranslated { get; set; }
-		public IEnumerable<EnvelopeDocumentDto>? Documents { get; set; }
+
+        public byte[]? DocResult { get; init; }
+
+        public IEnumerable<EnvelopeDocumentDto>? Documents { get; set; }
 	}
 }