[Feature Request] Question-and-answer style bot

## Describe the solution you'd like

bot that ignores the context of past conversations and only answers the most recent question

## Why the solution needed

For simple tasks, past conversations are often unnecessary. It would be nice to not have to press "New Chat" every time to reset the conversation history.

## Additional context

Allow "Question-and-answer style" to be set for each bot.

## Implementation feasibility

Are you willing to discuss the solution with us, decide on the approach, and assist with the implementation?

- [x] Yes
- [ ] No

The issue names no files, tests, or entry points; start by locating where bot settings and conversation history are handled. Done means a per-bot question-and-answer setting causes responses to use only the latest question, without requiring a new chat.

Written by the indexing model from the issue text.