Add Iron Proxy gateway

Install the official iron-control console and PostgreSQL alongside one central Iron Proxy. NanoClaw core supplies the generic gateway seam and human approval flow. Read docs/gateway-seam.md before changing the integration.

Use the bundled setup scripts and the source revisions in versions.json. The console is the upstream Rails application; its UI is not generated or copied into NanoClaw. This is a local Docker installation. Reuse this copy's recorded services and keys when refreshing it.

Install the provider payload

Copy the package's provider, approval middleware, tests, and agent guidance into their normal NanoClaw paths.