adapt repository features to services needs

SurveyLib.Infrastructure.EFCore/Repositories/AnswerRepository.cs

@@ -47,4 +47,14 @@ public class AnswerRepository : IAnswerRepository
             .ExecuteDeleteAsync();
         await _context.SaveChangesAsync();
     }
+
+    public async Task<IEnumerable<Answer>> GetAnswersByCompletionIdAsync(int completionId)
+    {
+        return await _context.Answers.Where(a => a.CompletionId == completionId).ToListAsync();
+    }
+
+    public async Task<IEnumerable<Answer>> GetAnswersByQuestionIdAsync(int questionId)
+    {
+        return await _context.Answers.Where(a => a.QuestionId == questionId).ToListAsync();
+    }
 }