Include personally enrolled courses in student course listings

src/Jiaowu.Api/Controllers/CoursesController.cs

@@ -340,11 +340,17 @@ public sealed class CoursesController(
             isTeacher && db.TeachingTasks.Any(task =>
                 task.CourseId == course.Id &&
                 task.Teachers.Any(item => item.Teacher!.UserId == userId)) ||
-            isStudent && db.TeachingTasks.Any(task =>
-                task.CourseId == course.Id &&
-                task.Classes.Any(item =>
-                    item.AdministrativeClass!.Students.Any(student =>
-                        student.UserId == userId))));
+            isStudent && (
+                db.TeachingTasks.Any(task =>
+                    task.CourseId == course.Id &&
+                    task.Classes.Any(item =>
+                        item.AdministrativeClass!.Students.Any(student =>
+                            student.UserId == userId))) ||
+                db.CourseEnrollments.Any(enrollment =>
+                    enrollment.Status == CourseEnrollmentStatus.Enrolled &&
+                    enrollment.Student!.UserId == userId &&
+                    enrollment.CourseSelectionOffering!.TeachingTask!.CourseId ==
+                        course.Id)));
     }
 
     private bool CanManage(Guid collegeId, CourseNature nature)