feat(fs): support get fileobj by path

[hshpy]

给阿里云盘open添加通过路径获取文件或目录信息，加快爆米花，emby等APP的起播速度。

fileobj获取顺序是Get实现路径获取，List向上级缓存查找，再向网盘获取。
以前只有非网盘驱动实现，忽略缓存影响不大，但目前有115open,阿里云盘open也实现，所以提前listcache查找。

[Copilot]

Pull Request Overview

This PR adds support for getting file or directory information by path in the AliyunDrive Open driver. The main changes involve replacing a custom interface with the standard Getter interface pattern used throughout the codebase.

• Removes the GetObjInfo interface and replaces it with the standard Get method implementation
• Implements the Get method in the AliyunDrive Open driver to retrieve files by path using the /adrive/v1.0/openFile/get_by_path API endpoint
• Simplifies the Link function by removing caching logic and using the standardized approach

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
internal/driver/driver.go	Removes the custom GetObjInfo interface definition
internal/op/fs.go	Simplifies Link function by removing cache logic and using GetUnwrap directly
drivers/aliyundrive_open/driver.go	Implements the Get method to retrieve files by path via API call
drivers/115_open/driver.go	Renames GetObjInfo method to Get to match standard interface

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