Add SFTP Sync extension

[jhs1873]

Summary

Adds SFTP Sync extension — sync files to remote servers via SFTP / FTP / FTPS on save.

• Repository: https://github.com/jhs1873/zed-sftp
• Release: https://github.com/jhs1873/zed-sftp/releases/tag/v0.1.0
• License: MIT

Features

• Auto upload on save (LSP didSave trigger)
• Supports SFTP (password / SSH key), FTP, FTPS
• Multi-profile config (dev / staging / prod) in .zed/sftp.json
• Glob-based ignore patterns
• MCP tools: upload / download / list / sync / delete — usable from Zed AI assistant
• Connection pooling with 5-min idle timeout

Architecture

• Rust wasm extension (src/lib.rs) bootstraps the Node-based sync-server
• sync-server is pre-built and published to GitHub Releases as sync-server.tar.gz
• Runtime npm deps (ssh2-sftp-client, basic-ftp, vscode-languageserver, MCP SDK, etc.) installed via
  npm_install_package

Testing

Tested locally as a dev extension on Windows with both SFTP (password) and FTP profiles.
End-to-end download → extract → LSP startup verified against the v0.1.0 release artifact.

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[jhs1873]

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