Model gateway endpoint namespaced under /inference/v1

Hive’s public model gateway has moved from the root path to a namespaced route: client-facing endpoints are now served under /inference/v1 instead of the previous /v1. Self-hosted deployments acting as a model gateway should point clients at https://hive.tuist.dev/inference/v1 (or the equivalent host configured for the deployment), and dashboard guidance and the self-hosting guide are updated to match. Upstream provider addresses remain unchanged, so only the path Hive presents to its clients needs to be updated.