chore: improve package.json

package.json

@@ -22,6 +22,7 @@
     "templates"
   ],
   "exports": {
+    "./package.json": "./package.json",
     "./router": "./client/router.js"
   },
   "dependencies": {
@@ -88,6 +89,10 @@
       "prettier --no-error-on-unmatched-pattern --cache --parser=typescript --write"
     ]
   },
+  "engines": {
+    "node": ">=18.13",
+    "pnpm": "^8.0.0"
+  },
   "publishConfig": {
     "access": "public"
   }