feat: implement launch at startup functionality in zn-ai

- Added a new setting for "launch at startup" in the GeneralSettingsPanel.
- Integrated the setting with the existing settings store and IPC mechanisms.
- Implemented platform-specific logic for enabling/disabling startup behavior in the main process.
- Created a new service for managing launch at startup settings, including Linux desktop entry creation.
- Added unit tests for the new functionality and ensured existing tests are updated accordingly.
- Updated i18n messages for the new setting in English, Chinese, and Japanese.

tests/general-settings-panel.test.tsx

@@ -0,0 +1,108 @@
+import React from 'react';
+import { fireEvent, render, screen, within } from '@testing-library/react';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { setLocale } from '../src/i18n';
+import GeneralSettingsPanel from '../src/pages/Setting/components/GeneralSettingsPanel';
+import type { GatewaySettingState } from '../src/pages/Setting/useGatewaySettingState';
+import type { SettingUpdateState } from '../src/pages/Setting/useSettingUpdateState';
+
+function createGatewayState(): GatewaySettingState {
+  return {
+    status: 'connected',
+    loading: false,
+    showLogs: false,
+    gatewayAutoStart: true,
+    gateway: {
+      ok: true,
+      status: 'connected',
+      initialized: true,
+      mode: null,
+      port: 18789,
+      pid: null,
+    },
+    logContent: '',
+    statusLoading: false,
+    logLoading: false,
+    restarting: false,
+    autoStartUpdating: false,
+    error: null,
+    lastFetchedAt: null,
+    refreshStatus: async () => {},
+    restartGateway: async () => {},
+    toggleLogs: async () => {},
+    loadLogs: async () => {},
+    viewLogs: async () => {},
+    setGatewayAutoStart: async () => {},
+  };
+}
+
+function createUpdateState(): SettingUpdateState {
+  return {
+    status: 'idle',
+    currentVersion: '1.0.0',
+    updateInfo: null,
+    progress: null,
+    error: null,
+    autoCheckUpdate: true,
+    autoDownloadUpdate: false,
+    checkUpdate: async () => {},
+    downloadUpdate: async () => {},
+    installUpdate: async () => {},
+    setAutoCheckUpdate: () => {},
+    setAutoDownloadUpdate: () => {},
+  };
+}
+
+describe('GeneralSettingsPanel', () => {
+  beforeEach(() => {
+    setLocale('zh');
+  });
+
+  it('renders the launch-at-startup setting after language and before gateway', () => {
+    render(
+      <GeneralSettingsPanel
+        themeMode="system"
+        language="zh"
+        launchAtStartup={false}
+        onThemeChange={async () => {}}
+        onLanguageChange={async () => {}}
+        onLaunchAtStartupChange={async () => {}}
+        gatewayState={createGatewayState()}
+        updateState={createUpdateState()}
+      />,
+    );
+
+    const languageLabel = screen.getByText('语言');
+    const launchLabel = screen.getByText('开机自动启动');
+    const gatewayLabel = screen.getByText('网关');
+
+    expect(languageLabel.compareDocumentPosition(launchLabel) & Node.DOCUMENT_POSITION_FOLLOWING).toBeTruthy();
+    expect(launchLabel.compareDocumentPosition(gatewayLabel) & Node.DOCUMENT_POSITION_FOLLOWING).toBeTruthy();
+  });
+
+  it('calls the launch-at-startup handler when the switch is toggled', () => {
+    const handleLaunchAtStartupChange = vi.fn();
+
+    render(
+      <GeneralSettingsPanel
+        themeMode="system"
+        language="zh"
+        launchAtStartup={false}
+        onThemeChange={async () => {}}
+        onLanguageChange={async () => {}}
+        onLaunchAtStartupChange={handleLaunchAtStartupChange}
+        gatewayState={createGatewayState()}
+        updateState={createUpdateState()}
+      />,
+    );
+
+    const launchLabel = screen.getByText('开机自动启动');
+    const launchRow = launchLabel.parentElement?.parentElement;
+    expect(launchRow).toBeTruthy();
+
+    const launchSwitch = within(launchRow as HTMLElement).getByRole('switch');
+    fireEvent.click(launchSwitch);
+
+    expect(handleLaunchAtStartupChange).toHaveBeenCalledWith(true);
+  });
+});