Add `gwa routes` or similar to retrieve helpful links

As an API provider, I need to get the URLs for my routes so that I can validate my configuration and set up my apps. Especially important for users of the test/training instance since the routes are extended.

Add a new option to `gwa status` (or a new command entirely) which returns a neat table including links to the following:
- Active Gateway/Namespace (this requires adding routing for manager/namespace/[name])
- Your Products page (/devportal/api-directory/your-products)
- Routes (for gateway services)

Definition of Done:
- New option available for gwa status as per above

Start by locating the `gwa status` implementation and the existing route handling for `manager/namespace/[name]`. Trace how gateway services and the `/devportal/api-directory/your-products` URL are determined. Done means a status option or command prints a neat table containing the active Gateway/Namespace, Products page, and gateway-service routes.

Written by the indexing model from the issue text.