對話模版

目前的最小可動版本截圖，有串到後端AI了。

The issue shows a screenshot of a working conversation interface connected to a backend AI. Look at the Vue components for the chat UI, likely in src/components or src/views. Understand how the current conversation flow works and where template structures might be defined. The goal is to implement conversation templates, but the specific requirements and scope are not described.

索引モデルが issue の本文から書いたものです。