feat: 支持静默启动（默认托盘运行）

[ziboh]

说明

添加「静默启动」设置：默认启动时不显示主窗口，仅托盘运行；关闭后渲染就绪时自动显示搜索窗口。

原有默认行为（show: false 冷启动）保持不变，本 PR 将其做成可配置项。

改动

• 设置页：通用设置增加「静默启动」开关，写入 settings-general.silentStart
• 主进程：监听一次性 renderer-ready，silentStart === false 时 showWindow()
• preload / 渲染进程：启动就绪后通知主进程

测试

• 默认 / 开启静默：启动不弹主窗口
• 关闭静默：渲染就绪后自动显示搜索窗口
• 与最新 main 冲突已解决

[gemini-code-assist]

Code Review

This pull request introduces a 'silent start' (静默启动) feature, allowing the application to start minimized in the system tray without showing the main window by default. This is implemented by adding a setting toggle in the UI, saving/loading the setting, and notifying the main process via a new 'renderer-ready' IPC event once the renderer is ready. The review feedback suggests changing 'ipcMain.on' to 'ipcMain.once' for the 'renderer-ready' event to prevent the window from unexpectedly showing again during page reloads or hot module replacements.

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[gemini-code-assist]

建议将 ipcMain.on 改为 ipcMain.once。

由于渲染进程可能会因为页面刷新、开发环境下的热重载（HMR）或异常重启等原因多次发送 renderer-ready 事件，使用 ipcMain.on 会导致每次渲染进程就绪时都重新触发窗口显示逻辑（在用户关闭了静默启动的情况下）。这可能会在用户已经手动隐藏窗口后，因为页面刷新而导致窗口意外弹出，影响用户体验。

使用 ipcMain.once 可以确保该自动显示逻辑在应用启动时仅执行一次。

Suggested change

	ipcMain.on('renderer-ready', () => {
	ipcMain.once('renderer-ready', () => {