FIPS-support

## Definition of done

- Ensure changelog reflects new FIPs artifacts
- Check links to existing FIPs artifacts
- Migrate https://developer.konghq.com/gateway/fips-support/#configure-fips to AIGW 2.x

## Information

- https://developer.konghq.com/gateway/fips-support/#configure-fips
- [FIPS rename ticket](https://konghq.atlassian.net/browse/AG-1730)

Per this conversation https://kongstrong.slack.com/archives/C0AKJ4F2LBS/p1789560999383909?thread_ts=1789557320.430759&cid=C0AKJ4F2LBS FIPs is on-prem only. We can migrate the page fairly directly and ensure it is linked to from https://developer.konghq.com/ai-gateway/configure-on-prem/

## Due date (optional)

## Size

- M (Medium) Example: writing a UI how to for a straightforward product, adding a plugin example

Start with the existing FIPS page at developer.konghq.com/gateway/fips-support/#configure-fips and the AIGW on-premise page at developer.konghq.com/ai-gateway/configure-on-prem/. Migrate the configuration content for AIGW 2.x, update the changelog and existing FIPS links, and ensure the page is linked from the on-premise documentation.

Written by the indexing model from the issue text.