feat: 🗓️ 新增任务块排期能力并完善课程与日程模型

Version: 0.1.1.dev.260207

- 新增并测试通过将任务块排进日程接口 ✅
- 批量导入课程接口增加单双周功能，支持只在单双周上课的课程 📚
- 任务块时间定位逻辑调整为「第几周-周几」模式 🧭

refactor: 🔨 重构时间与日程数据结构

- 完成绝对日期与相对时间的转换逻辑 🔄
  - 后续可根据需求灵活决定时间的传入与输出类型
- 再次重构 schedule 表单结构
  - 拆分为 schedule_event（单）与 schedule（多）
  - 建立前者对后者的一对多关系 🧩

fix: 🐛 大幅调整表结构与业务逻辑，修复大量历史遗留 bug 🔥

backend/service/course.go

@@ -41,33 +41,61 @@ func (ss *CourseService) AddUserCourses(ctx context.Context, req model.UserImpor
 			return respond.WrongCourseInfo
 		}
 	}
-	//2.转换为 Schedule 切片
 	var finalSchedules []model.Schedule
+	var finalScheduleEvents []model.ScheduleEvent
+	var pos []int
 	for _, course := range req.Courses {
-		var schedules []model.Schedule
+		// 避免取 range 迭代变量字段地址导致指针复用问题
+		location := course.Location
 		for _, arrangement := range course.Arrangements {
+			weekType := arrangement.WeekType
 			for week := arrangement.StartWeek; week <= arrangement.EndWeek; week++ {
+				if weekType == "odd" && week%2 == 0 {
+					continue
+				}
+				if weekType == "even" && week%2 != 0 {
+					continue
+				}
+				//2.转换为 Schedule_event 切片
+				scheduleEvent := model.ScheduleEvent{
+					UserID:        userID,
+					Name:          course.CourseName,
+					Location:      &location,
+					Type:          "course",
+					RelID:         nil,
+					CanBeEmbedded: course.IsAllowTasks,
+				}
+				finalScheduleEvents = append(finalScheduleEvents, scheduleEvent)
+				//3.转换为 Schedule 切片
 				for section := arrangement.StartSection; section <= arrangement.EndSection; section++ {
 					schedule := model.Schedule{
-						Type:          "course",
-						Week:          week,
-						DayOfWeek:     arrangement.DayOfWeek,
-						Section:       section,
-						Status:        "normal",
-						UserID:        userID,
-						CanBeEmbedded: course.IsAllowTasks,
+						Week:      week,
+						DayOfWeek: arrangement.DayOfWeek,
+						Section:   section,
+						Status:    "normal",
+						UserID:    userID,
+						EventID:   0,
 					}
-					schedules = append(schedules, schedule)
+					finalSchedules = append(finalSchedules, schedule)
+					pos = append(pos, len(finalScheduleEvents)-1)
 				}
 			}
 		}
-		finalSchedules = append(finalSchedules, schedules...)
 	}
-	//3.调用 DAO 方法添加课程
-	err := ss.dao.AddUserCourses(finalSchedules)
-	if err != nil {
-		return err
-	}
-	//4.返回结果
-	return nil
+	//TODO 冲突处理、重复检测...预计0.2.0版本之前完成
+	//4.事务：插入两个表要么都成功，要么都回滚
+	return ss.dao.Transaction(func(txDAO *dao.CourseDAO) error {
+		ids, err := txDAO.AddUserCoursesIntoScheduleEvents(ctx, finalScheduleEvents)
+		if err != nil {
+			return err
+		}
+		// 将生成的 ScheduleEvent ID 赋值给对应的 Schedule 的 EventID 字段
+		for i := range finalSchedules {
+			finalSchedules[i].EventID = ids[pos[i]]
+		}
+		if err := txDAO.AddUserCoursesIntoSchedule(ctx, finalSchedules); err != nil {
+			return err
+		}
+		return nil
+	})
 }