chore: add AI app category

Signed-off-by: Jana Peper <jana.peper@nextcloud.com>

Author: janepie

appinfo/info.xml

@@ -109,6 +109,7 @@ Learn more about the Nextcloud Ethical AI Rating [in our blog](https://nextcloud
 		<developer>https://github.com/nextcloud/integration_openai</developer>
 	</documentation>
 	<category>integration</category>
+	<category>ai</category>
 	<website>https://github.com/nextcloud/integration_openai</website>
 	<bugs>https://github.com/nextcloud/integration_openai/issues</bugs>
 	<screenshot>https://github.com/nextcloud/integration_openai/raw/main/img/screenshot1.jpg</screenshot>