Initial Neutralino.js POC for kokoro-widget

Lightweight alternative to the Electron build (~5MB vs ~300MB).
Uses system webview (WebKit2GTK on Linux, WKWebView on macOS,
WebView2 on Windows). Same UI and feature set as the Electron build:
WebSocket audio client, volume control, host/port settings, tray icon,
hide-to-tray on close, CLI args (--host, --port, --volume).

Note: Linux requires libwebkit2gtk-4.0 or libwebkit2gtk-4.1.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

neutralino.config.json

@@ -0,0 +1,38 @@
+{
+  "applicationId": "com.pai.kokoro-widget",
+  "version": "1.0.0",
+  "defaultMode": "window",
+  "documentRoot": "/www/",
+  "url": "/",
+  "enableServer": true,
+  "enableNativeAPI": true,
+  "nativeAllowList": [
+    "app.*",
+    "os.*",
+    "storage.*",
+    "window.*",
+    "events.*",
+    "debug.*"
+  ],
+  "modes": {
+    "window": {
+      "title": "PAI Voice",
+      "width": 360,
+      "height": 540,
+      "minWidth": 300,
+      "minHeight": 400,
+      "icon": "/www/icon.png",
+      "alwaysOnTop": false,
+      "borderless": false,
+      "maximize": false
+    }
+  },
+  "cli": {
+    "binaryName": "kokoro-widget",
+    "resourcesPath": "/www/",
+    "extensionsPath": "/extensions/",
+    "clientLibrary": "/www/neutralino.js",
+    "binaryVersion": "6.5.0",
+    "clientVersion": "6.5.0"
+  }
+}