[阶段3] FAM-Core 瘦身为管理后台+Oracle-Sync 同步引擎,FAM-UI 改读同步镜像 - 删除 scheduler/dispatcher/poller/event_receiver/video_server,新增 oracle_sync 每30分钟拉增量写 sync_* 镜像表;member_manager/chat_handler 改走同步数据;UI 移除帧图改为事件时间线;DDL 新增 sync_videos/events/people/cursor
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