fix(desktop): restore managed Node server startup (#348)

## Summary
- revert the Bun standalone desktop packaging path and restore the
server's original `dist/bin.js` bootstrap flow
- add a managed Node runtime for Electron and Tauri that downloads only
the current platform/arch artifact into `~/.config/codenomad`
- update desktop startup and packaging scripts so packaged apps use the
managed runtime consistently, and clean up Electron's expected
navigation-abort log noise

## Testing
- npm run typecheck --workspace @neuralnomads/codenomad-electron-app
- cargo check
- npm run build --workspace @neuralnomads/codenomad
- npm run build:mac --workspace @neuralnomads/codenomad-electron-app
- launch
`packages/electron-app/release/mac-arm64/CodeNomad.app/Contents/MacOS/CodeNomad`
and verify the packaged server reaches ready with the managed Node
runtime

packages/tauri-app/src-tauri/Cargo.toml

@@ -5,16 +5,16 @@ edition = "2021"
 license = "MIT"
 
 [build-dependencies]
-tauri-build = { version = "2.5.6", features = [] }
+tauri-build = { version = "2.5.2", features = [] }
 
 [dependencies]
-tauri = { version = "2.10.1", features = [ "devtools"] }
+tauri = { version = "2.5.2", features = [ "devtools"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 serde_yaml = "0.9"
 base64 = "0.22"
 rustls = { version = "0.23", features = ["ring"] }
-reqwest = { version = "0.12", default-features = false, features = ["http2", "charset", "json", "stream", "rustls-tls"] }
+reqwest = { version = "0.12", default-features = false, features = ["blocking", "http2", "charset", "json", "stream", "rustls-tls"] }
 regex = "1"
 parking_lot = "0.12"
 anyhow = "1"
@@ -27,6 +27,10 @@ tauri-plugin-opener = "2"
 tauri-plugin-global-shortcut = "2"
 url = "2"
 tauri-plugin-notification = "2"
+flate2 = "1"
+sha2 = "0.10"
+tar = "0.4"
+zip = { version = "2", default-features = false, features = ["deflate"] }
 
 [target.'cfg(windows)'.dependencies]
 windows-sys = { version = "0.59", features = ["Win32_Foundation", "Win32_Security_Cryptography", "Win32_UI_Shell", "Win32_Security", "Win32_System_JobObjects"] }