refactor!: rebrand wraith to alknet

Rename all crates, CLI commands, constants, type names, doc comments,
and documentation from wraith to alknet. Includes wire-protocol changes:
ALPN wraith-ssh -> alknet-ssh, reserved destination prefix wraith- ->
alknet-, SSH auth username wraith -> alknet.

crates/alknet-napi/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "alknet-napi"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "Node.js native addon for Alknet via napi-rs: connect() and serve() SSH tunnel functions"
+repository.workspace = true
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+alknet-core = { path = "../alknet-core", features = ["tls", "iroh"] }
+napi = { version = "3", features = ["async", "error_anyhow"] }
+napi-derive = "3"
+tokio = { version = "1", features = ["io-util", "sync", "rt", "macros", "net", "time", "signal"] }
+russh = "0.49"
+async-trait = "0.1"
+rustls-pemfile = "2"
+rustls-pki-types = "1"
+iroh = "0.34"
+url = "2"
+tracing = "0.1"