life quality changes

- refactored SurveyController.cs
- added ProducesResponseType to every endpoint in every controller
- remade mappers

SurveyBackend/SurveyBackend.API/DTOs/Survey/OutputSurveyDto.cs

@@ -0,0 +1,9 @@
+namespace SurveyBackend.DTOs.Survey;
+
+public class OutputSurveyDto
+{
+    public required int Id { get; set; }
+    public required string Title { get; set; }
+    public required string Description { get; set; }
+    public int? CreatedBy { get; set; }
+}