v0.3.1

Enterprise licensing (open-core)

• License settings page (Settings → License) showing whether the running
  build is Community or Enterprise, and the status of any applied license key.
• Offline license verification — Enterprise licenses are Ed25519-signed
  tokens verified locally against a built-in public key. No license server and
  no phone-home; works air-gapped, with a 14-day grace period past expiry.
• Open-core edition system groundwork: enterprise features (SSO, SCIM,
  audit-log export, priority support) are gated by both the build and the
  license. The Community edition is unaffected and fully functional on its own.
• Embedded the production license-signing public key.

Notes

• Enterprise feature implementations ship in the separate Enterprise build; this
  release provides the core-side licensing framework they plug into.