chore: define node version constraints (#2703)

`>=20.18.1` is required for `npm i && npm run build && npm run start` to succeed.
`npm run raw` would require `>=22.7.0`.

Reviewed-on: OpenWF/SpaceNinjaServer#2703
Co-authored-by: Sainan <63328889+Sainan@users.noreply.github.com>
Co-committed-by: Sainan <63328889+Sainan@users.noreply.github.com>

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
             - name: Setup Node.js environment
               uses: actions/setup-node@v4.0.2
               with:
-                  node-version: ">=20.6.0"
+                  node-version: ">=20.18.1"
             - run: npm ci
             - run: cp config-vanilla.json config.json
             - run: npm run verify

package.json

@@ -57,5 +57,8 @@
     "eslint-plugin-prettier": "^5.2.5",
     "prettier": "^3.5.3",
     "tree-kill": "^1.2.2"
+  },
+  "engines": {
+    "node": ">=20.18.1"
   }
 }