ayointegral/cloud-sandbox-backstage ? reverse-engineered prompt

Build me a Backstage developer portal for a cloud native team, with a clean home page, software catalog, search, TechDocs, and a scaffolder so people can create new apps, infrastructure, and docs from templates.

I also want the custom features from this repo, like organization branding settings, ownership management for catalog items, and GitHub team sync. Set it up to work with GitHub login, PostgreSQL, Redis, and MinIO, and make sure it runs nicely in local dev with Docker and hot reload.

Please include the starter catalog content and a good set of templates for common things like Node, Python, React, Spring Boot, Terraform, Kubernetes, and documentation pages. If you need to check current Backstage docs or plugin setup details online, go ahead and do that. Keep it polished enough that I can run it locally and start adding my own teams and services right away.