- 新建 wvp_ai_camera_snapshot 表(camera_code → cos_key 映射) - 新建 AiCameraSnapshotMapper(getCosKey / upsert) - AiScreenshotServiceImpl: handleCallback 成功后将 cos_key 写入 DB - AiScreenshotServiceImpl: proxyScreenshotImage 增加 DB 兜底路径 Redis 缓存(5min) → DB(永久) → CosUtil 生成 presigned URL → 下载 - AiRoiController: Cache-Control 从 60s 增大到 300s Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>