move services to separate project

+ add GetByUserId methods to Survey

SurveyLib.Infrastructure.EFCore/Repositories/SurveyRepository.cs

@@ -41,4 +41,9 @@ public class SurveyRepository : ISurveyRepository
         _context.Surveys.Remove(entity);
         await _context.SaveChangesAsync();
     }
+
+    public async Task<IEnumerable<Survey>> GetSurveysByUserIdAsync(int userId)
+    {
+        return await _context.Surveys.Where(s => s.CreatedBy == userId).ToListAsync();
+    }
 }