chore: add a restore script

[xqvvu]

此脚本用于恢复被错误更新为 S3 key 的 fileId/imageId

使用场景：

• 迁移后 fileId 被改成了 S3 key
• 但 S3 上的文件丢失了
• GridFS 数据还在

恢复逻辑：

1. 遍历所有 fileId 以 "dataset/" 开头的 collection（这些是已迁移但 S3 丢失的）
2. 从 S3 key 中提取 datasetId 和文件名
3. 在 GridFS 中查找匹配的文件
4. 恢复 fileId 为原始的 GridFS ObjectId

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TestGru Assignment

Summary

Link	CommitId	Status	Reason
Detail	228d9f9	✅ Finished

History Assignment

Files

File	Pull Request
projects/app/src/pages/api/admin/restorev4143.ts	🔴 Closed #6288

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