I want to create api for Ghibli Image, so in backed I am Using "Gemini 2.0 (Image Genration) Experimental" Here is my api key "AIzaSyCDmG_8ioOXAWGIpcHo6Tmc9k0vjyOjmtw" I will deploy my api in Vercel so according give me node js. I need only Server.js, package.json, and vercel.json only. User directly Access api by endpoint of api parameters. Also don't need to set Wehoook, user image propmt must enter in api url parameters. Remember this api only Provide image. For response show Image, if else show json error message. 

I don't need to Use .env, direct add api in server.js after provide all the bash command for install all important package. 

Why can not GET / api? And in system propmt add like Imagine this in Ghibli style with my watermark Made By Kaiiddo: {user Prompt}. you can use like this also ""