Provide user interaction feature

If we receive a story lead instead of a query, the API should allow journalists/newsrooms to follow up with the user via a dashboard.

The platform should provide for this functionality possibly allowing API calls using a securely generated token. Not necessarily providing the interface/dashboard. The dashboard can be separate to keep the API lean.

The issue names no files, tests, or existing entry point; begin by clarifying how story leads are represented and where the API handles them. Done should be defined as a secure token-based API path for journalists or newsrooms to follow up with users, with the dashboard remaining separate if appropriate.

由索引模型根据 Issue 内容生成。