life quality changes

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

SurveyBackend/SurveyBackend.Services/Services/QuestionService.cs

@@ -9,10 +9,13 @@ namespace SurveyBackend.Services.Services;
 public class QuestionService : IQuestionService
 {
     private readonly IQuestionRepository _questionRepository;
+    private readonly ISurveyRepository _surveyRepository;
 
-    public QuestionService(IQuestionRepository questionRepository, IUserContext userContext)
+    public QuestionService(IQuestionRepository questionRepository, ISurveyRepository surveyRepository,
+        IUserContext userContext)
     {
         _questionRepository = questionRepository;
+        _surveyRepository = surveyRepository;
     }
 
     public async Task AddQuestionAsync(QuestionBase question)
@@ -49,6 +52,12 @@ public class QuestionService : IQuestionService
 
     public async Task<IEnumerable<QuestionBase>> GetQuestionsBySurveyIdAsync(int surveyId)
     {
+        var survey = await _surveyRepository.GetByIdAsync(surveyId);
+        if (survey is null)
+        {
+            throw new NotFoundException("Survey not found");
+        }
+
         return await _questionRepository.GetQuestionsBySurveyId(surveyId);
     }
 }