支持为同一学期、同一课程的多个教学任务批量创建相同实验项目。

新增批量排课表，可为多个实验项目分别设置日期、节次、实验室和容量。
批量排课采用原子事务：任一项目发生教室、教师、班级或课表冲突，整批不写入。
已发布项目批量新增场次时，继续按原逻辑通知学生。
后端继续执行管理范围、教学任务状态、开放日期和容量校验。
页面在 390px 手机宽度下无横向溢出。

tests/Jiaowu.Api.Tests/ExperimentsControllerTests.cs

@@ -12,6 +12,112 @@ namespace Jiaowu.Api.Tests;
 
 public sealed class ExperimentsControllerTests
 {
+    [Fact]
+    public async Task BatchProjects_CreateSameDefinitionForSameCourseTasks()
+    {
+        await using var fixture = await ExperimentFixture.CreateAsync();
+        var controller = fixture.Controller(fixture.ManagerScope);
+
+        var result = await controller.CreateProjects(
+            fixture.BatchProjectRequest(
+                ExperimentArrangementMode.Centralized),
+            CancellationToken.None);
+
+        Assert.IsType<CreatedResult>(result);
+        var projects = await fixture.Db.ExperimentProjects
+            .OrderBy(x => x.TeachingTaskId)
+            .ToListAsync();
+        Assert.Equal(2, projects.Count);
+        Assert.Equal(2, projects.Select(x => x.TeachingTaskId).Distinct().Count());
+        Assert.All(projects, project =>
+        {
+            Assert.Equal("LAB-BATCH", project.Code);
+            Assert.Equal("公共实验任务", project.Name);
+            Assert.Equal(ExperimentProjectStatus.Draft, project.Status);
+        });
+    }
+
+    [Fact]
+    public async Task BatchSessions_RollsBackAllRowsWhenOneConflicts()
+    {
+        await using var fixture = await ExperimentFixture.CreateAsync();
+        var controller = fixture.Controller(fixture.ManagerScope);
+        await controller.CreateProjects(
+            fixture.BatchProjectRequest(
+                ExperimentArrangementMode.SelfScheduled),
+            CancellationToken.None);
+        var projectIds = await fixture.Db.ExperimentProjects
+            .OrderBy(x => x.TeachingTaskId)
+            .Select(x => x.Id)
+            .ToListAsync();
+
+        var result = await controller.CreateSessions(
+            new ExperimentSessionBatchRequest(
+            [
+                new ExperimentSessionBatchItem(
+                    projectIds[0],
+                    fixture.Classroom.Id,
+                    fixture.Term.StartDate,
+                    1,
+                    2,
+                    20,
+                    null),
+                new ExperimentSessionBatchItem(
+                    projectIds[1],
+                    fixture.Classroom.Id,
+                    fixture.Term.StartDate,
+                    1,
+                    2,
+                    20,
+                    null)
+            ]),
+            CancellationToken.None);
+
+        Assert.IsType<ConflictObjectResult>(result);
+        fixture.Db.ChangeTracker.Clear();
+        Assert.Empty(await fixture.Db.ExperimentSessions.ToListAsync());
+    }
+
+    [Fact]
+    public async Task BatchSessions_CreatesRowsAtomicallyWhenAllAreValid()
+    {
+        await using var fixture = await ExperimentFixture.CreateAsync();
+        var controller = fixture.Controller(fixture.ManagerScope);
+        await controller.CreateProjects(
+            fixture.BatchProjectRequest(
+                ExperimentArrangementMode.SelfScheduled),
+            CancellationToken.None);
+        var projectIds = await fixture.Db.ExperimentProjects
+            .OrderBy(x => x.TeachingTaskId)
+            .Select(x => x.Id)
+            .ToListAsync();
+
+        var result = await controller.CreateSessions(
+            new ExperimentSessionBatchRequest(
+            [
+                new ExperimentSessionBatchItem(
+                    projectIds[0],
+                    fixture.Classroom.Id,
+                    fixture.Term.StartDate,
+                    1,
+                    2,
+                    20,
+                    null),
+                new ExperimentSessionBatchItem(
+                    projectIds[1],
+                    fixture.SecondClassroom.Id,
+                    fixture.Term.StartDate,
+                    1,
+                    2,
+                    20,
+                    null)
+            ]),
+            CancellationToken.None);
+
+        Assert.IsType<CreatedResult>(result);
+        Assert.Equal(2, await fixture.Db.ExperimentSessions.CountAsync());
+    }
+
     [Fact]
     public async Task CentralizedProject_PublishesAndUsesTeachingTaskRoster()
     {
@@ -421,6 +527,15 @@ public sealed class ExperimentsControllerTests
                     }
                 ]
             };
+            var secondTask = new TeachingTask
+            {
+                TaskNumber = "2099-1-CSLAB-02",
+                Name = "系统实验教学班 02",
+                AcademicTermId = term.Id,
+                CourseId = course.Id,
+                Capacity = 40,
+                Status = TeachingTaskStatus.Published
+            };
             db.AddRange(
                 manager,
                 studentUser,
@@ -435,7 +550,8 @@ public sealed class ExperimentsControllerTests
                 teacher,
                 term,
                 course,
-                task);
+                task,
+                secondTask);
             for (var period = 1; period <= 12; period++)
             {
                 db.ScheduleTimeSlots.Add(new ScheduleTimeSlot
@@ -486,6 +602,21 @@ public sealed class ExperimentsControllerTests
                 Term.StartDate,
                 Term.StartDate.AddDays(14));
 
+        public ExperimentProjectBatchRequest BatchProjectRequest(
+            ExperimentArrangementMode mode) =>
+            new(
+                Db.TeachingTasks
+                    .OrderBy(x => x.TaskNumber)
+                    .Select(x => x.Id)
+                    .ToList(),
+                "LAB-BATCH",
+                "公共实验任务",
+                mode,
+                "多个教学任务共用的实验内容。",
+                "携带校园卡。",
+                Term.StartDate,
+                Term.StartDate.AddDays(14));
+
         public ExperimentSessionRequest SessionRequest(
             int startPeriod,
             int periodCount,