Add /settings/environments for the server-owned Environments REST API:
list, create, edit, and delete environments. The page lives in the new
Workflows settings nav section, before Variables.
- Shared environment-form component covering provider, image (reference +
inline Dockerfile), resources, network, lifecycle, labels, env vars, and
volumes
- Edit uses the environment revision as If-Match for optimistic concurrency
and surfaces 409 conflicts; the default environment is protected from
deletion
- Adds environmentsApi client, environments query keys, and
useEnvironments/useEnvironment hooks
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>