chore(deps): add vue as dependency to enable Vitepress customization

As recommended on: https://vitepress.dev/guide/getting-started

Author: tmlmt

package.json

@@ -60,7 +60,8 @@
     "typescript": "5.9.3",
     "typescript-eslint": "8.46.4",
     "vitepress": "2.0.0-alpha.15",
-    "vitest": "4.0.8"
+    "vitest": "4.0.8",
+    "vue": "3.5.26"
   },
   "bugs": {
     "url": "https://github.com/tmlmt/cooklang-parser/issues",