fix(tray): kill child PID before IPC close to avoid macOS NSStatusItem orphan

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "9router-app",
-  "version": "0.4.44",
+  "version": "0.4.45",
   "description": "9Router web dashboard",
   "private": true,
   "scripts": {