Malaybhai11/keyking ? reverse-engineered prompt

Build me KeyKing, a secure API key management app that keeps secrets encrypted on my machine and never exposes them in plain text. I want a polished desktop app for creating, viewing, and exporting encrypted vaults, plus a simple way to use those vaults from my dev server or serverless functions so my API keys only get decrypted when the app actually runs.

Also make a clean website and demo page that explain how it works and show how to use it in a real project. The whole thing should feel modern and easy for developers to trust, with a strong focus on local security, zero trust, and not leaking anything into .env files. Please make the UX feel premium, with a nice dashboard, clear vault management, and straightforward setup instructions. If you need to check the latest docs for the desktop framework or web tooling, look them up online first.