fix: F12 P2 follow-up — batch imports set departmentId, optimize getDescendantIds, enforce campus root invariant

apps/server/src/classrooms/classrooms.controller.ts

@@ -211,7 +211,8 @@ export class ClassroomsController {
         supervisor: String(row.getCell(7).value || '') || undefined,
       });
     });
-    const result = await this.service.batchImport(rows);
+    const departmentId = req.headers?.['x-campus-id'] ? parseInt(String(req.headers['x-campus-id']), 10) || undefined : undefined;
+    const result = await this.service.batchImport(rows, departmentId);
     await this.logService.log({
       userId: req.user?.id,
       username: req.user?.username,

apps/server/src/classrooms/classrooms.service.ts

@@ -66,6 +66,7 @@ export class ClassroomsService {
       roomType?: string;
       courseType?: string;
     }[],
+    departmentId?: number,
   ) {
     let imported = 0;
     let skipped = 0;
@@ -74,7 +75,7 @@ export class ClassroomsService {
       if (!row.name?.trim()) { skipped++; continue; }
       const exists = await this.repo.findOne({ where: { name: row.name.trim() } });
       if (exists) { errors.push(`教室 ${row.name} 已存在`); skipped++; continue; }
-      await this.repo.save(this.repo.create({ ...row, capacity: row.capacity || 30 }));
+      await this.repo.save(this.repo.create({ ...row, capacity: row.capacity || 30, departmentId: departmentId ?? undefined }));
       imported++;
     }
     return { message: `成功导入 ${imported} 间教室，跳过 ${skipped} 间`, imported, skipped, errors: errors.length > 0 ? errors : undefined };