Create /app/public/tiles in the runner image, bind-mount it in compose, and document the Coolify volume plus upload steps; restructure .gitignore (test artifacts, /public/tiles, backups).
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
