`ask` has never been deployed, and the CI step in this branch will publish it.
Its limiter counts rows in ai_chat_log to cap requests at 8/min and 120/day per
IP, but no migration ever created that table, and the limiter fails open when
the count cannot be read.
Shipping `ask` without this would put an unauthenticated endpoint with
Access-Control-Allow-Origin: * in front of paid model APIs with no limit at all.
Applied to the live database as well.
