chore: add russh SSH/SFTP dependencies

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Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

src-tauri/Cargo.toml

@@ -18,6 +18,12 @@ tauri = { version = "2.1.0", features = [] }
 thiserror = "1.0.63"
 uuid = { version = "1.11.0", features = ["v4"] }
 chrono = { version = "0.4.38", features = ["clock"] }
+russh = "0.46"
+russh-keys = "0.46"
+russh-sftp = "2.0"
+async-trait = "0.1"
+tokio = { version = "1", features = ["sync"] }
+shellexpand = "3.1"
 
 [build-dependencies]
 tauri-build = { version = "2.1.0", features = [] }