chore: use cross-env for docs:dev on Windows shells

Author: Reuben-Sun

package-lock.json

@@ -5,12 +5,13 @@
   "private": true,
   "description": "API-driven knowledge base with FastAPI + VitePress + GitHub Pages",
   "scripts": {
-    "docs:dev": "CHOKIDAR_USEPOLLING=true CHOKIDAR_INTERVAL=300 vitepress dev docs",
+    "docs:dev": "cross-env CHOKIDAR_USEPOLLING=true CHOKIDAR_INTERVAL=300 vitepress dev docs",
     "docs:dev:fast": "vitepress dev docs",
     "docs:build": "vitepress build docs",
     "docs:preview": "vitepress preview docs"
   },
   "devDependencies": {
+    "cross-env": "^10.1.0",
     "markdown-it-mathjax3": "^4.3.2",
     "vitepress": "1.6.3"
   }