自动排课：保留手工安排，按教师、行政班、周次、节次、容量和场地约束补排。

课程约束：可限定校区、教学楼、指定教室、允许上课日、最早/最晚节次。
无教室课程：教室可为空，但仍校验教师和班级冲突。
作息维护：按学期维护节次、上下课时间和启用状态。
发布保护：发布前重新检查全部约束，并阻止学时未排满的课表发布。
工作台升级：增加“排课规则与作息”“自动排课”入口，自动生成后仍支持手工微调。
同时兼容 SQLite 和 MySQL，已生成正式迁移。

src/Jiaowu.Api/Domain/Academic/ScheduleEntities.cs

@@ -20,7 +20,7 @@ public sealed class ScheduleEntry : EntityBase
     public SchedulePlan? SchedulePlan { get; set; }
     public Guid TeachingTaskId { get; set; }
     public TeachingTask? TeachingTask { get; set; }
-    public Guid ClassroomId { get; set; }
+    public Guid? ClassroomId { get; set; }
     public Classroom? Classroom { get; set; }
     public int DayOfWeek { get; set; }
     public int StartPeriod { get; set; }
@@ -31,6 +31,40 @@ public sealed class ScheduleEntry : EntityBase
     public string? Notes { get; set; }
 }
 
+public sealed class ScheduleTimeSlot : EntityBase
+{
+    public Guid AcademicTermId { get; set; }
+    public AcademicTerm? AcademicTerm { get; set; }
+    public int PeriodNumber { get; set; }
+    public required string Name { get; set; }
+    public TimeOnly StartsAt { get; set; }
+    public TimeOnly EndsAt { get; set; }
+    public bool IsEnabled { get; set; } = true;
+}
+
+public sealed class TeachingTaskScheduleConstraint : EntityBase
+{
+    public Guid TeachingTaskId { get; set; }
+    public TeachingTask? TeachingTask { get; set; }
+    public bool RequiresClassroom { get; set; } = true;
+    public Guid? RequiredCampusId { get; set; }
+    public Campus? RequiredCampus { get; set; }
+    public Guid? RequiredBuildingId { get; set; }
+    public Building? RequiredBuilding { get; set; }
+    public string? AllowedDayOfWeeks { get; set; }
+    public int? EarliestPeriod { get; set; }
+    public int? LatestPeriod { get; set; }
+    public ICollection<TeachingTaskAllowedClassroom> AllowedClassrooms { get; set; } = [];
+}
+
+public sealed class TeachingTaskAllowedClassroom
+{
+    public Guid TeachingTaskScheduleConstraintId { get; set; }
+    public TeachingTaskScheduleConstraint? TeachingTaskScheduleConstraint { get; set; }
+    public Guid ClassroomId { get; set; }
+    public Classroom? Classroom { get; set; }
+}
+
 public enum SchedulePlanStatus
 {
     Draft = 1,