life quality changes

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

SurveyBackend/SurveyBackend.API/Mappers/AuthMapper.cs

@@ -0,0 +1,15 @@
+using SurveyBackend.Core.Models;
+using SurveyBackend.DTOs;
+
+namespace SurveyBackend.Mappers;
+
+public static class AuthMapper
+{
+    public static User UserRegistrationToModel(UserRegistrationDto dto) => new User
+    {
+        Email = dto.Email,
+        FirstName = dto.FirstName,
+        LastName = dto.LastName,
+        Password = dto.Password,
+    };
+}