Shelf 2.0.0

Shelf 2.0 turns the file-only server into a modgud-federated, PostgreSQL-backed platform with a full admin UI and SSO login (OIDC code flow). Docs serving is unchanged; the CI/CD upload API keeps its shape and keys under /_api.

Highlights: admin UI (products/versions/users/analytics/settings), federated SSO login with silent re-login, UI-managed API keys, page-view analytics with GeoIP, product metadata (tags/visibility), PostgreSQL as source of truth with one-time JSON seed import.

See CHANGELOG.md for the full entry including breaking changes and the upgrade guide.

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