Advanced tab settings are not applied to SSH connections

[sunxiaobin89]

Problem

The Advanced tab (compression, keepAlive, keepAliveInterval, serverAliveCountMax) and Proxy tab (proxyType, proxyHost, proxyPort, proxyUsername, proxyPassword) settings in the connection dialog are persisted (after #73) but have no effect on actual connections. They are never sent to the backend, and the backend has no corresponding fields.

Root cause

• The frontend ssh_connect request only sends connection_id/host/port/username/auth_method/password/key_path/passphrase — no advanced/proxy fields.
• Backend ConnectRequest (commands.rs) and SshConfig (ssh/mod.rs) have no such fields.
• SshClient::connect hardcodes keepalive_interval: Some(60s) and keepalive_max: 3 regardless of user config.
• No compression negotiation — russh config never enables it.
• No HTTP/SOCKS proxy tunnel support anywhere in the backend.

Suggested scope (keepAlive first is recommended)

1. keepAlive / keepAliveInterval / serverAliveCountMax — pass them to the backend and drive russh's keepalive_interval / keepalive_max instead of the hardcoded 60s/3. Smallest, highest-value change.
2. compression — enable russh compression negotiation from the toggle.
3. proxy tunnel — implement SSH over HTTP/SOCKS proxy (largest change; russh has no built-in proxy support).

Related

• Persistence fix (merged): fix(connections): apply advanced SSH and proxy options to live connections #73
• Relevant files:
  • src/components/connection-dialog.tsx (frontend request)
  • src-tauri/src/commands.rs (ConnectRequest, ssh_connect)
  • src-tauri/src/ssh/mod.rs (SshConfig, SshClient::connect)