fix：成绩提交显示500实际提交成功

src/Jiaowu.Api/Controllers/GradesController.cs

@@ -549,6 +549,8 @@ public sealed class GradesController(
             .Include(x => x.Records)
             .ThenInclude(x => x.ItemScores)
             .Include(x => x.TeachingTask)
+            .ThenInclude(x => x!.Course)
+            .Include(x => x.TeachingTask)
             .ThenInclude(x => x!.Teachers)
             .ThenInclude(x => x.Teacher)
             .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);