Advanced AI Prompt for Managing Secure Build-time Variables in Vite

Act as a Frontend Security Architect. Harden Vite's native environment variable management system. Override the default `VITE_` prefix by configuring a highly custom [ENV_PREFIX] string to obfuscate environment intent. You must programmatically implement a strict Node.js validation layer (utilizing Zod or Joi) that executes before the Vite build begins, guaranteeing that highly [SENSITIVE_VARS] (e.g., private AWS keys, DB passwords) are mathematically impossible to be leaked or bundled into the client-side JavaScript. Demonstrate how to weaponize Vite's `define` property to inject dynamic build-time constants for global feature flagging, and supply a Node script that automatically generates a safe `.env.example` file based entirely on the parsed schema.