Add ApiExplorerSettings to DTOs and update controllers

This commit introduces the `[ApiExplorerSettings(IgnoreApi = true)]` attribute to various DTO classes to exclude them from API documentation. The `using Microsoft.AspNetCore.Mvc;` directive has been added to several files to support ASP.NET Core MVC features.

Additionally, comments in `HistoryController.cs` have been reformatted for clarity, and `LocalizationController.cs` has been updated with standard API controller attributes. These changes improve code organization and maintain cleaner API documentation.

EnvelopeGenerator.Application/DTOs/EnvelopeDto.cs

@@ -2,9 +2,11 @@
 using DigitalData.EmailProfilerDispatcher.Abstraction.Attributes;
 using DigitalData.UserManager.Application.DTOs.User;
 using EnvelopeGenerator.Domain.Entities;
+using Microsoft.AspNetCore.Mvc;
 
 namespace EnvelopeGenerator.Application.DTOs
 {
+    [ApiExplorerSettings(IgnoreApi = true)]
     public record EnvelopeDto() : IUnique<int>
     {
 		public int Id { get; set; }