Added property for AIS data (2026-01-26)

AIS data now have a property stream to show the origin of the message. The property may be 'terra' (onshore AIS receivers), 'satellite' or 'offshore'.

The OpenAPI documentation has been updated:

• https://historic.ais.barentswatch.no/index.html#/
• https://live.ais.barentswatch.no/index.html