feat:脚本文件预览-backend

API.md

@@ -508,6 +508,8 @@ queued ──→ running ──┬─→ succeeded
 | `POST` | `/api/v1/data-resources/uploads/{upload_id}/bind` | 绑定已完成上传为数据资源 |
 | `GET` | `/api/v1/data-resources` | 列表(owner 作用域 + visibility 过滤) |
 | `GET` | `/api/v1/data-resources/{id}` | 详情 |
+| `GET` | `/api/v1/data-resources/{id}/content` | 同源流式读取文件字节(预览/下载) |
+| `GET` | `/api/v1/data-resources/{id}/preview` | 表格抽样预览(csv/tsv, `limit` 默认 100) |
 | `POST` | `/api/v1/data-resources/{id}/download-url` | 生成 presigned GET URL |
 | `DELETE` | `/api/v1/data-resources/{id}` | 软删 |