Generic Helm chart for self-hosting with a Tuist-specific production overlay

The Hive Helm chart is now generic and self-hostable by anyone. The default values no longer assume Tuist-specific infrastructure such as 1Password External Secrets, the ghcr-pull image pull secret, or Hetzner Cloud block storage. A new secrets.existingSecret value lets operators bring their own Kubernetes Secret. Tuist’s production configuration moves into a separate values-production.yaml overlay, so helm template hive infra/helm/hive renders only generic resources with no references to Tuist, 1Password, or hcloud. Sources: https://github.com/tuist/hive/commit/9d9e15e, https://raw.githubusercontent.com/tuist/hive/server%400.1.0/README.md