chore: only allow pnpm using devEngines (#20201)

Author: ConsoleTVs

package.json

@@ -5,6 +5,12 @@
   "engines": {
     "node": "^20.19.0 || >=22.12.0"
   },
+  "devEngines": {
+    "packageManager": {
+      "name": "pnpm",
+      "onFail": "error"
+    }
+  },
   "homepage": "https://vite.dev/",
   "repository": {
     "type": "git",
@@ -18,7 +24,6 @@
     "vite"
   ],
   "scripts": {
-    "preinstall": "npx only-allow pnpm",
     "postinstall": "simple-git-hooks",
     "format": "prettier --write --cache .",
     "lint": "eslint --cache .",