Release version 0.13.4

• feat(chat): Web and remote workspaces now support file attachments.
• fix(uploads): Uploads now enforce safer size limits, optional storage quotas, path checks, and clearer errors.
• fix(remote): Remote desktop attachment uploads and WebSocket traffic now stay routed through the selected proxy connection.
• fix(acp): ACP sessions now recover more reliably after refreshes and WebSocket reconnects.
• fix(acp): Restored conversations now keep saved selector preferences.
• fix(server): Data directories are now resolved consistently for databases, uploads, and pet assets.
• feat(debug): Event metrics are now available for replay, snapshot, and subscription lag diagnostics.
• chore(acp): Clippy now passes without the connection manager warning.

发布版本 0.13.4

• 功能(聊天)：Web 模式和远端工作区现在支持文件附件。
• 修复(上传)：上传现在具备更安全的大小限制、可选存储配额、路径校验和更清晰的错误提示。
• 修复(远端)：远端桌面的附件上传和 WebSocket 流量会稳定走当前选中的代理连接。
• 修复(ACP)：ACP 会话在刷新和 WebSocket 重连后恢复更可靠。
• 修复(ACP)：恢复会话时会保留已保存的选择器偏好。
• 修复(服务端)：数据库、上传文件和桌宠资源的数据目录解析保持一致。
• 功能(调试)：新增事件指标，便于排查回放、快照和订阅滞后问题。
• 调整(ACP)：Clippy 不再报告连接管理器相关警告。