feat: Cindy在MacOS下缺少TrayIcon

### 使用场景 / Use case

macOS下没有TrayIcon，应用感觉不够完整

### 当前问题 / Current limitation

macOS下没有TrayIcon，应用感觉不够完整

### 期望方案 / Proposed solution

UI团队设计TrayIcon，使用Electron TrayIcon相关API完成此业务，配合docker闪烁

### 已考虑的替代方案 / Alternatives considered

_No response_

Start by locating the Electron desktop entry point and any existing Docker status or UI code, then review the Electron Tray API and the UI team's TrayIcon design. Confirm the expected macOS behavior, including how Docker activity should be shown; done means the agreed tray icon appears and responds correctly on macOS.

Written by the indexing model from the issue text.