refactor: add .editorconfig and refactor code

Endpoint/Controllers/V1/ImportController.cs

@@ -49,7 +49,7 @@ public class ImportController(IMediator mediator, IOptionsSnapshot<GeneralConfig
             GroupIds = request.Groups,
             LectureHallIds = request.LectureHalls,
             ProfessorIds = request.Professors
-        })).Schedules;
+        })).Schedules.ToList();
 
         if (result.Count == 0)
             return NoContent();
@@ -58,8 +58,8 @@ public class ImportController(IMediator mediator, IOptionsSnapshot<GeneralConfig
         using var package = new ExcelPackage();
         var worksheet = package.Workbook.Worksheets.Add("Расписание");
 
-        int row = 1;
-        int col = 1;
+        var row = 1;
+        var col = 1;
 
         worksheet.Cells[row, col++].Value = "День";
         worksheet.Cells[row, col++].Value = "Пара";