refactor: remove redundant postinstall script

The postinstall script is no longer needed since we've already
fixed the platform checks directly in the forked nativephp-electron
package. This simplifies the setup and avoids duplicate efforts.

Author: vijaythecoder

package.json

@@ -10,8 +10,7 @@
         "dev": "vite",
         "format": "prettier --write resources/",
         "format:check": "prettier --check resources/",
-        "lint": "eslint . --fix",
-        "postinstall": "node scripts/postinstall.js"
+        "lint": "eslint . --fix"
     },
     "devDependencies": {
         "@eslint/js": "^9.19.0",