成绩通知：仅在某门课程成绩正式发布后自动发送，按成绩单学生名单通知，不展示具体分数；发布状态与通知同一次提交。

手动发信：移除“成绩通知”选项，只能发送普通通知，原有角色与范围权限保持不变。
选课通知：管理员关闭一轮选课时，自动向每位参与学生发送一条汇总通知，包含最终选中课程及候补未成功课程；候补失效、轮次关闭和通知生成保持原子性。
关闭选课界面会明确提示发送通知，并显示实际通知人数。

tests/Jiaowu.Api.Tests/CourseSelectionsControllerTests.cs

@@ -95,18 +95,31 @@ public sealed class CourseSelectionsControllerTests
         var adminController = new CourseSelectionsController(
             db,
             new AdminDataScope());
-        Assert.IsType<OkObjectResult>(await adminController.CloseRound(
+        var closeResult = Assert.IsType<OkObjectResult>(await adminController.CloseRound(
             data.RoundId,
             CancellationToken.None));
+        Assert.Equal(2, ReadIntProperty(closeResult.Value, "NotifiedStudentCount"));
 
         db.ChangeTracker.Clear();
         var waitlist = await db.CourseEnrollments.SingleAsync(
             x => x.StudentId == data.FirstWaiterStudentId);
         Assert.Equal(CourseEnrollmentStatus.Expired, waitlist.Status);
         Assert.NotNull(waitlist.WithdrawnAt);
-        Assert.True(await db.Notifications.AnyAsync(x =>
-            x.UserId == data.FirstWaiterUserId &&
-            x.Title == "课程候补已结束"));
+        var resultNotifications = await db.Notifications
+            .Where(x => x.Title == "第一轮选课结果")
+            .OrderBy(x => x.UserId)
+            .ToListAsync();
+        Assert.Equal(2, resultNotifications.Count);
+        var selectedNotification = Assert.Single(resultNotifications
+            .Where(x => x.UserId == data.EnrolledUserId));
+        Assert.Contains("最终选中 1 门", selectedNotification.Content);
+        Assert.Contains("《程序设计基础》", selectedNotification.Content);
+        var waitlistNotification = Assert.Single(resultNotifications
+            .Where(x => x.UserId == data.FirstWaiterUserId));
+        Assert.Contains("本轮未选中课程", waitlistNotification.Content);
+        Assert.Contains("候补未成功 1 门", waitlistNotification.Content);
+        Assert.Equal(NotificationCategory.CourseSelection, waitlistNotification.Category);
+        Assert.Equal("/course-selections", waitlistNotification.LinkUrl);
     }
 
     [Fact]
@@ -337,6 +350,14 @@ public sealed class CourseSelectionsControllerTests
             DisplayName = displayName
         };
 
+    private static int ReadIntProperty(object? value, string propertyName)
+    {
+        Assert.NotNull(value);
+        var property = value.GetType().GetProperty(propertyName);
+        Assert.NotNull(property);
+        return Assert.IsType<int>(property.GetValue(value));
+    }
+
     private static Student CreateStudent(
         string number,
         string name,