fix: 归档删除改为软删除

apps/server/src/classes/classes.controller.ts

@@ -170,7 +170,7 @@ export class ClassesController {
       userId: req.user?.id,
       username: req.user?.username,
       module: '班级管理',
-      action: '删除班级',
+      action: '归档班级',
       targetId: +id,
       targetType: 'class',
       ipAddress,

apps/server/src/classes/classes.service.ts

@@ -300,23 +300,9 @@ export class ClassesService {
     return { success: true };
   }
 
-  /** 物理删除班级（已归档的才能删除） */
+  /** 归档班级（兼容旧删除入口，不物理删除） */
   async remove(id: number) {
-    const cls = await this.classRepo.findOne({ where: { id } });
-    if (!cls) throw new NotFoundException('班级不存在');
-    if (!cls.isArchived) throw new BadRequestException('请先归档再删除');
-
-    const sessionCount = await this.attendanceSessionRepo.count({
-      where: { classId: id },
-    });
-    if (sessionCount > 0) {
-      throw new ConflictException(
-        `无法删除已产生 ${sessionCount} 个考勤场次的班级。请先取消或停用班级以保护历史考勤数据。`,
-      );
-    }
-
-    await this.classRepo.remove(cls);
-    return { success: true };
+    return this.archive(id);
   }
 
   async getStudents(classId: number) {