feat(storage): configure S3 object storage

Summary

• Add runtime configuration for S3-compatible object storage behind HIVE_OBJECT_STORAGE_PROVIDER=s3.
• Expose Hive.ObjectStorage helpers that validate required S3 fields and avoid returning secrets in public config.
• Wire generic Helm defaults and Tuist production External Secrets mappings for the hive-object-storage 1Password item.
• Document the self-hosted S3 environment variables and Helm setup flow.

Testing

• mix format
• mix test
• mix compile --warnings-as-errors
• mix credo
• helm template hive infra/helm/hive
• helm template hive infra/helm/hive -f infra/helm/hive/values-production.yaml

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