List, read, confirm, dismiss and undo the changes a model proposed, and
read their audit. The routes sit under /api/chats with the other chat
routes and need the chats feature. A person reaches only their own
proposals; another person's id is a 404.
Assisted-by: Claude Code:claude-sonnet-5-5
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>