[Feature]: Support FTP/SFTP protocol for connecting to legacy servers

[EdsionGuan]

Feature description

Is your feature request related to a problem? Please describe.

I have several legacy project servers that only support FTP/SFTP connections for file transfers, and do not allow SSH shell access due to security policies. Currently, I cannot use Wave Terminal to manage files on these servers directly, and have to rely on separate FTP clients, which breaks my workflow.

I would like Wave Terminal to support FTP and SFTP protocols as additional file system backends, similar to how wsh currently handles file operations with wsh://local/ paths.

Ideally, I could use commands like:

This would allow seamless file management across local, remote SSH, and legacy FTP/SFTP servers within the same wsh command ecosystem, making Wave Terminal a unified file management hub.

Describe alternatives you've considered

• Using a standalone FTP client (works but breaks workflow integration and requires context switching)
• Mounting FTP via third-party tools like curlftpfs or sshfs (unstable, requires extra dependencies and setup)
• Deploying wsh directly on the legacy server (not possible due to restricted environments and lack of shell access)
• Using sftp command-line tool in a terminal block (works, but lacks integration with wsh file commands and Wave's unified file management)

Additional context

• The project already shows signs of extensible file system backends (e.g., S3 support), so adding FTP/SFTP as a new fileshare module may be architecturally feasible.
• SFTP uses the SSH protocol, which might be partially reusable from the existing SSH connection logic in the codebase.
• Many developers still maintain legacy systems that only expose FTP/SFTP interfaces, so this feature could benefit a significant number of users.

Implementation Suggestion

No response

Anything else?

No response