Deprecate services in favor of MediatR integration

This commit introduces the `[Obsolete("Use MediatR")]` attribute to various service fields and methods across multiple controllers and extension classes, signaling a transition to MediatR for handling requests and commands.

Key changes include:
- Marking `IEnvelopeService`, `IEnvelopeReceiverService`, and `IEnvelopeTypeService` as obsolete in their respective controllers.
- Updating `AddEnvelopeGeneratorInfrastructureServices` to utilize `IRepository`.
- Refactoring `AddCommandManagerRunner` and `CreateHost` methods to indicate obsolescence.
- Replacing `DigitalData.Core.DTO` with `DigitalData.Core.Abstraction.Application.DTO` in using directives.

These changes modernize the codebase and improve command and query handling while cleaning up service dependencies.

EnvelopeGenerator.GeneratorAPI/Controllers/EnvelopeController.cs

@@ -1,4 +1,4 @@
-using DigitalData.Core.DTO;
+using DigitalData.Core.Abstraction.Application.DTO;
 using EnvelopeGenerator.Application.Contracts.Services;
 using EnvelopeGenerator.Application.Envelopes.Commands;
 using EnvelopeGenerator.Application.Envelopes.Queries.Read;
@@ -6,8 +6,6 @@ using MediatR;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Newtonsoft.Json;
-using System.ComponentModel;
-using System.ComponentModel.DataAnnotations.Schema;
 
 namespace EnvelopeGenerator.GeneratorAPI.Controllers;
 
@@ -31,6 +29,7 @@ namespace EnvelopeGenerator.GeneratorAPI.Controllers;
 public class EnvelopeController : ControllerBase
 {
     private readonly ILogger<EnvelopeController> _logger;
+    [Obsolete("Use MediatR")]
     private readonly IEnvelopeService _envelopeService;
     private readonly IMediator _mediator;
 
@@ -40,6 +39,7 @@ public class EnvelopeController : ControllerBase
     /// <param name="logger">Der Logger, der für das Protokollieren von Informationen verwendet wird.</param>
     /// <param name="envelopeService">Der Dienst, der für die Verarbeitung von Umschlägen zuständig ist.</param>
     /// <param name="mediator"></param>
+    [Obsolete("Use MediatR")]
     public EnvelopeController(ILogger<EnvelopeController> logger, IEnvelopeService envelopeService, IMediator mediator)
     {
         _logger = logger;
@@ -59,6 +59,7 @@ public class EnvelopeController : ControllerBase
     /// <response code="500">Ein unerwarteter Fehler ist aufgetreten.</response>
     [Authorize]
     [HttpGet]
+    [Obsolete("Use MediatR")]
     public async Task<IActionResult> GetAsync([FromQuery] ReadEnvelopeQuery envelope)
     {
         if (User.GetId() is int intId)
@@ -98,6 +99,7 @@ public class EnvelopeController : ControllerBase
     /// <response code="404">Das Dokument wurde nicht gefunden oder ist nicht verfügbar.</response>
     /// <response code="500">Ein unerwarteter Fehler ist aufgetreten.</response>
     [HttpGet("doc-result")]
+    [Obsolete("Use MediatR")]
     public async Task<IActionResult> GetDocResultAsync([FromQuery] int id, [FromQuery] bool view = false)
     {
         if (User.GetId() is int intId)
@@ -154,4 +156,4 @@ public class EnvelopeController : ControllerBase
         else
             return Ok(res);
     }
-}
+}