namespace ProposalSystem.Application.DTOs; public record PresignedUploadResponse( string UploadUrl, string S3Key, DateTime ExpiresAt ); public record PdfDownloadResponse( string DownloadUrl, DateTime ExpiresAt ); public record VendorProposalResponse( Guid Id, string VendorName, string FileName, decimal TotalVendorCost, string ProcessingStatus, object? ExtractedData );