cozsweet-frontend-nextjs/docs/backend/unlock.md

用途：解锁某一条历史里的付费/私密消息。 请求体： { "messageId": "消息ID" } 需要带登录 token： Authorization: Bearer Content-Type: application/json 返回示例： { "code": 200, "message": "success", "success": true, "data": { "unlocked": true, "content": "完整消息内容", "reason": "ok", "creditBalance": 9180, "creditsCharged": 10, "requiredCredits": 10, "shortfallCredits": 0, "lockDetail": { "locked": false, "showContent": true, "showUpgrade": false, "reason": null, "hint": null, "detail": null } } } 如果积分不够，会返回 unlocked:false，并带 requiredCredits / shortfallCredits / creditBalance。