refactor: add .editorconfig and refactor code

SqlData/Application/Cqrs/LectureHall/Queries/GetLectureHallList/LectureHallListVm.cs

@@ -10,5 +10,5 @@ public class LectureHallListVm
     /// <summary>
     /// The list of lecture hall.
     /// </summary>
-    public IList<LectureHallLookupDto> LectureHalls { get; set; } = new List<LectureHallLookupDto>();
+    public IEnumerable<LectureHallLookupDto> LectureHalls { get; set; } = [];
 }