OAuth-based data source connections (Google Drive, Notion, Slack, …).
Integrations connect external data sources (Google Drive, Notion, Slack, …)
into a namespace via OAuth. The SDK exposes the org-level provider catalog
and namespace-scoped connection lifecycle.
All connection field names are snake_case on the wire and in the SDK:
namespace_id, connection_id, session_id, auth_link_url, created_by,
created_at, updated_at, org_id.