Refactor DTOs for improved structure and documentation

Transitioned from records to classes for flexibility, added XML documentation for clarity, and updated property definitions to use standard getters and setters. Introduced the `required` keyword for essential properties, removed unnecessary constructors, and enhanced property descriptions for better readability. Additionally, overridden `GetHashCode` in `ReceiverReadDto` for proper collection behavior.

EnvelopeGenerator.Application/DTOs/ConfigDto.cs

@@ -3,19 +3,45 @@ using Microsoft.AspNetCore.Mvc;
 using System.ComponentModel.DataAnnotations.Schema;
 using System.Text.Json.Serialization;
 
-namespace EnvelopeGenerator.Application.DTOs
+namespace EnvelopeGenerator.Application.DTOs;
+
+/// <summary>
+/// Data Transfer Object representing configuration settings.
+/// </summary>
+[ApiExplorerSettings(IgnoreApi = true)]
+public class ConfigDto : IUnique<int>
 {
-    [ApiExplorerSettings(IgnoreApi = true)]
-    public record ConfigDto(
-        string DocumentPath,
-        int SendingProfile,
-        string SignatureHost,
-        string ExternalProgramName,
-        string ExportPath) : IUnique<int>
-    {
-        [NotMapped]
-        [JsonIgnore]
-        [Obsolete("Configuration does not have an ID; it represents a single table in the database.")]
-        public int Id => throw new InvalidOperationException("This configuration does not support an ID as it represents a single row in the database.");
-    };
+    /// <summary>
+    /// Gets or sets the path to the document.
+    /// </summary>
+    public string DocumentPath { get; set; }
+
+    /// <summary>
+    /// Gets or sets the sending profile identifier.
+    /// </summary>
+    public int SendingProfile { get; set; }
+
+    /// <summary>
+    /// Gets or sets the signature host URL or name.
+    /// </summary>
+    public string SignatureHost { get; set; }
+
+    /// <summary>
+    /// Gets or sets the name of the external program.
+    /// </summary>
+    public string ExternalProgramName { get; set; }
+
+    /// <summary>
+    /// Gets or sets the path where exports will be saved.
+    /// </summary>
+    public string ExportPath { get; set; }
+
+    /// <summary>
+    /// Gets the ID of the configuration.
+    /// This DTO represents a single row in the database and does not support an ID.
+    /// </summary>
+    [NotMapped]
+    [JsonIgnore]
+    [Obsolete("Configuration does not have an ID; it represents a single table in the database.")]
+    public int Id => throw new InvalidOperationException("This configuration does not support an ID as it represents a single row in the database.");
 }