Version:0.0.4.dev.260203

feat: 📚 完成课程导入与校验接口（赶在 token 过期前…）

- 实现课程导入接口 ✅
- 实现课程信息校验接口 🔍
- 测试通过 🧪

fix: 🐛 修了一堆 bug，15 分钟 accessToken 默默见证了时间的流逝 ⏳😭

backend/service/schedule.go

@@ -0,0 +1,71 @@
+package service
+
+import (
+	"fmt"
+
+	"github.com/LoveLosita/smartflow/backend/dao"
+	"github.com/LoveLosita/smartflow/backend/model"
+	"github.com/LoveLosita/smartflow/backend/respond"
+)
+
+type ScheduleService struct {
+	// 伸出手：准备接住 DAO
+	dao *dao.ScheduleDAO
+}
+
+// NewScheduleService 创建 ScheduleService 实例
+func NewScheduleService(dao *dao.ScheduleDAO) *ScheduleService {
+	return &ScheduleService{
+		dao: dao,
+	}
+}
+
+func CheckSingleCourse(req model.UserCheckCourseRequest) bool {
+	for _, arrangement := range req.Arrangements {
+		if arrangement.StartWeek > arrangement.EndWeek ||
+			arrangement.DayOfWeek < 1 || arrangement.DayOfWeek > 7 ||
+			arrangement.StartSection < 1 || arrangement.EndSection < arrangement.StartSection ||
+			arrangement.EndSection > 12 || arrangement.StartWeek < 1 || arrangement.EndWeek > 24 {
+			return false
+		}
+	}
+	return true
+}
+
+// AddUserCourses 添加用户课程表
+func (ss *ScheduleService) AddUserCourses(req model.UserImportCoursesRequest, userID int) error {
+	//1.先校验参数是否正确
+	for _, course := range req.Courses {
+		result := CheckSingleCourse(course)
+		if !result {
+			return respond.WrongCourseInfo
+		}
+	}
+	//2.转换为 Schedule 切片
+	for _, course := range req.Courses {
+		var schedules []model.Schedule
+		for _, arrangement := range course.Arrangements {
+			for week := arrangement.StartWeek; week <= arrangement.EndWeek; week++ {
+				sections := fmt.Sprintf("%d-%d", arrangement.StartSection, arrangement.EndSection)
+				schedule := model.Schedule{
+					Type:          "course",
+					Week:          week,
+					DayOfWeek:     arrangement.DayOfWeek,
+					Sections:      sections,
+					Status:        "normal",
+					UserID:        userID,
+					CanBeEmbedded: course.IsAllowTasks,
+				}
+				schedules = append(schedules, schedule)
+			}
+		}
+		//3.调用 DAO 方法添加课程
+		err := ss.dao.AddUserCourses(schedules)
+		if err != nil {
+			return err
+		}
+	}
+
+	//4.返回结果
+	return nil
+}