Refactor EnvelopeTypeController to use MediatR

Replace IEnvelopeTypeService with IMediator in EnvelopeTypeController and update GetAllAsync to use ReadEnvelopeTypesQuery. Remove obsolete service-based code and attributes. Also, remove AsNoTracking() from repository query in ReadEnvelopeTypesQueryHandler.

EnvelopeGenerator.GeneratorAPI/Controllers/EnvelopeTypeController.cs

@@ -1,5 +1,5 @@
-using DigitalData.Core.Abstraction.Application.DTO;
-using EnvelopeGenerator.Application.Common.Interfaces.Services;
+using MediatR;
+using EnvelopeGenerator.Application.EnvelopeTypes.Queries;
 using Microsoft.AspNetCore.Mvc;
 
 namespace EnvelopeGenerator.GeneratorAPI.Controllers;
@@ -13,36 +13,27 @@ namespace EnvelopeGenerator.GeneratorAPI.Controllers;
 public class EnvelopeTypeController : ControllerBase
 {
     private readonly ILogger<EnvelopeTypeController> _logger;
-
-    [Obsolete("Use MediatR")]
-    private readonly IEnvelopeTypeService _service;
+    private readonly IMediator _mediator;
 
     /// <summary>
     /// 
     /// </summary>
     /// <param name="logger"></param>
-    /// <param name="service"></param>
-    [Obsolete("Use MediatR")]
-    public EnvelopeTypeController(ILogger<EnvelopeTypeController> logger, IEnvelopeTypeService service)
+    /// <param name="mediator"></param>
+    public EnvelopeTypeController(ILogger<EnvelopeTypeController> logger, IMediator mediator)
     {
         _logger = logger;
-        _service = service;
+        _mediator = mediator;
     }
 
     /// <summary>
     /// 
     /// </summary>
     /// <returns></returns>
-    [Obsolete("Use MediatR")]
     [HttpGet]
     public async Task<IActionResult> GetAllAsync()
     {
-        return await _service.ReadAllAsync().ThenAsync(
-            Success: Ok,
-            Fail: IActionResult (msg, ntc) =>
-            {
-                _logger.LogNotice(ntc);
-                return ntc.HasFlag(Flag.NotFound) ? NotFound() : StatusCode(StatusCodes.Status500InternalServerError);
-            });
+        var result = await _mediator.Send(new ReadEnvelopeTypesQuery());
+        return Ok(result);
     }
 }