raxx21/ai-image-arena — reverse-engineered prompt

Build me a simple web app called AI Image Arena. I want it to run a blind head to head contest between two AI image models. For each battle, it should first create 5 creative prompts in different styles, then have both image models generate images from the same prompt at the same time, then have a judge model score each pair for creativity, quality, and how well it matched the prompt.

The important part is that the user should not know which model is which during the battle. Label them Model A and Model B, randomize that assignment each time, show the rounds as they happen, and keep a live scoreboard. At the end, add a Reveal Models button so the user can see which real model was A and B and who won overall.

Please include a full 5 round battle mode and a quick 1 round test mode. Use one OpenRouter API key from env, and make it easy to swap the two image models later. A clean polished interface would be great. If you need details, check current docs online.