linshenkx/prompt-optimizer ? reverse-engineered prompt

Build me a web app that works like a "prompt optimizer." I want to be able to paste in a prompt I'm working on, and have an AI analyze and rewrite it to be more effective and get better results. It should show me the original version and the new, optimized version side-by-side, so I can easily compare them and see the improvements. This should work for both regular user prompts and system prompts.

The app needs to connect to different models like OpenAI's GPT, Gemini, and DeepSeek, and let me securely enter my own API keys. It's important that all the data is handled on the client-side for privacy. It should also have a feature for improving prompts for image generation. Please build it as a modern web app using TypeScript that I can deploy myself on Vercel.