improvement(media): 聊天媒体支持 file_id 兜底定位

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- 图片/视频消息无 MD5 时，解析并下发 file_id，用于本地资源兜底定位与展示
- 后端 chat_media/open_folder 支持 md5/file_id；视频优先可 Range 的文件响应，并在需要时解密落盘
- 前端聊天页与 API 调用适配 file_id；补充媒体 URL 可用性判断
- 解密页补充“获取密钥”提示，支持手动输入/保存密钥；README 同步说明；更新音频图标资源

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2977094657

2025-12-23 16:39:38 +08:00

parent a4d652230f

commit 36f5067730

9 changed files with 790 additions and 126 deletions

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