Cathesth/TRPG — reverse-engineered prompt

Build me YEOUL, an interactive text RPG web app where people can either play a one on one adventure with an AI game master or create their own scenarios without coding.

Players should be able to type natural actions, not just click fixed choices, and the story should keep track of the current scene, characters, choices, and consequences. Make the game feel immersive with streamed text responses and AI generated scene or NPC images if keys are available.

Creators need a simple visual scenario builder where they can make scenes, connect choices, save drafts, undo changes, and use AI help to write descriptions, generate NPCs, and check the story for broken logic. Also include a friendly AI guide named 여울 that can answer questions about how to use the service.

Use a Python FastAPI backend, simple HTML and JavaScript frontend, Tailwind styling, PostgreSQL storage, and environment variables for API keys. Make it runnable locally and ready to deploy on Railway.