fix: release beds/lockers in batchCheckOut

The batchCheckOut method was not releasing assigned beds and lockers
after checkout, leaving them orphaned as 'occupied'. Added the same
release pattern used in checkOut() — using runner.manager.update()
since batchCheckOut operates inside a QueryRunner transaction.

apps/server/src/departments/departments.controller.ts

@@ -35,6 +35,13 @@ export class DepartmentsController {
     return this.departmentsService.findTree();
   }
 
+  /** 获取钉钉同步的部门树，供"从部门创建班级"使用 */
+  @Get('synced')
+  @RequirePermission('department:view')
+  findSyncedTree() {
+    return this.departmentsService.findSyncedTree();
+  }
+
   @Get(':id')
   @RequirePermission('department:view')
   findOne(@Param('id', ParseIntPipe) id: number) {

apps/server/src/departments/departments.service.ts

@@ -52,6 +52,35 @@ export class DepartmentsService {
     return roots;
   }
 
+  /** 获取钉钉同步的部门树（只返回 source='dingtalk' 的部门） */
+  async findSyncedTree(): Promise<Department[]> {
+    const all = await this.deptRepo.find({
+      where: { status: 'active', source: 'dingtalk' },
+      order: { sortOrder: 'ASC', name: 'ASC' },
+    });
+
+    const byParent = new Map<number | null, Department[]>();
+    for (const dept of all) {
+      const key = dept.parentId ?? null;
+      const list = byParent.get(key);
+      if (list) {
+        list.push(dept);
+      } else {
+        byParent.set(key, [dept]);
+      }
+    }
+
+    const attachChildren = (dept: Department): void => {
+      const children = byParent.get(dept.id) ?? [];
+      dept.children = children;
+      for (const child of children) attachChildren(child);
+    };
+
+    const roots = byParent.get(null) ?? [];
+    for (const root of roots) attachChildren(root);
+    return roots;
+  }
+
   async findOne(id: number): Promise<Department> {
     const dept = await this.deptRepo.findOne({ where: { id } });
     if (!dept) throw new NotFoundException('部门不存在');