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/launch-at-startup.test.ts

@@ -0,0 +1,155 @@
+// @vitest-environment node
+
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+const originalPlatform = process.platform;
+
+const {
+  configManagerMock,
+  electronAppMock,
+  loggerMock,
+  mkdirMock,
+  rmMock,
+  setLoginItemSettingsMock,
+  testHome,
+  writeFileMock,
+} = vi.hoisted(() => {
+  const suffix = Math.random().toString(36).slice(2);
+  const setLoginItemSettingsMock = vi.fn();
+  const mkdirMock = vi.fn();
+  const rmMock = vi.fn();
+  const writeFileMock = vi.fn();
+  const configManagerMock = {
+    get: vi.fn(),
+  };
+  const loggerMock = {
+    info: vi.fn(),
+    warn: vi.fn(),
+    error: vi.fn(),
+  };
+  const electronAppMock = {
+    isPackaged: true,
+    getName: () => 'zn-ai',
+    getPath: (name: string) => (name === 'home' ? `/tmp/zn-ai-launch-startup-${suffix}` : '/tmp'),
+    setLoginItemSettings: setLoginItemSettingsMock,
+  };
+
+  return {
+    configManagerMock,
+    electronAppMock,
+    loggerMock,
+    mkdirMock,
+    rmMock,
+    setLoginItemSettingsMock,
+    testHome: `/tmp/zn-ai-launch-startup-${suffix}`,
+    writeFileMock,
+  };
+});
+
+vi.mock('electron', () => ({
+  app: electronAppMock,
+}));
+
+vi.mock('@electron/service/config-service', () => ({
+  default: configManagerMock,
+}));
+
+vi.mock('@electron/service/logger', () => ({
+  logManager: loggerMock,
+  default: loggerMock,
+}));
+
+vi.mock('node:fs/promises', () => ({
+  mkdir: mkdirMock,
+  rm: rmMock,
+  writeFile: writeFileMock,
+}));
+
+vi.mock('node:path', () => ({
+  dirname: (path: string) => path.slice(0, path.lastIndexOf('/')) || '/',
+  join: (...parts: string[]) => parts.join('/').replace(/\/+/g, '/'),
+}));
+
+function setPlatform(platform: string): void {
+  Object.defineProperty(process, 'platform', { value: platform, writable: true });
+}
+
+describe('launch-at-startup service', () => {
+  beforeEach(async () => {
+    vi.resetModules();
+    vi.clearAllMocks();
+    configManagerMock.get.mockReturnValue(false);
+    electronAppMock.isPackaged = true;
+  });
+
+  afterEach(() => {
+    Object.defineProperty(process, 'platform', { value: originalPlatform, writable: true });
+  });
+
+  it('uses login item settings on Windows', async () => {
+    setPlatform('win32');
+    const { applyLaunchAtStartupSetting } = await import('@electron/service/launch-at-startup');
+
+    await applyLaunchAtStartupSetting(true);
+
+    expect(setLoginItemSettingsMock).toHaveBeenCalledWith({
+      openAtLogin: true,
+      openAsHidden: false,
+    });
+  });
+
+  it('uses login item settings on macOS', async () => {
+    setPlatform('darwin');
+    const { applyLaunchAtStartupSetting } = await import('@electron/service/launch-at-startup');
+
+    await applyLaunchAtStartupSetting(false);
+
+    expect(setLoginItemSettingsMock).toHaveBeenCalledWith({
+      openAtLogin: false,
+      openAsHidden: false,
+    });
+  });
+
+  it('creates and removes a Linux autostart desktop entry', async () => {
+    setPlatform('linux');
+    const { applyLaunchAtStartupSetting } = await import('@electron/service/launch-at-startup');
+    const autostartPath = `${testHome}/.config/autostart/zn-ai.desktop`;
+
+    await applyLaunchAtStartupSetting(true);
+
+    expect(mkdirMock).toHaveBeenCalledWith(`${testHome}/.config/autostart`, { recursive: true });
+    expect(writeFileMock).toHaveBeenCalledTimes(1);
+    expect(writeFileMock).toHaveBeenCalledWith(
+      autostartPath,
+      expect.stringContaining('[Desktop Entry]'),
+      'utf8',
+    );
+    expect(writeFileMock.mock.calls[0]?.[1]).toContain('Name=zn-ai');
+    expect(writeFileMock.mock.calls[0]?.[1]).toContain('Exec=');
+
+    await applyLaunchAtStartupSetting(false);
+
+    expect(rmMock).toHaveBeenCalledWith(autostartPath, { force: true });
+  });
+
+  it('syncs the persisted setting from config on startup', async () => {
+    setPlatform('win32');
+    configManagerMock.get.mockReturnValue(true);
+    const { syncLaunchAtStartupSettingFromConfig } = await import('@electron/service/launch-at-startup');
+
+    await syncLaunchAtStartupSettingFromConfig();
+
+    expect(configManagerMock.get).toHaveBeenCalledWith('launchAtStartup');
+    expect(setLoginItemSettingsMock).toHaveBeenCalledWith({
+      openAtLogin: true,
+      openAsHidden: false,
+    });
+  });
+
+  it('does not throw on unsupported platforms', async () => {
+    setPlatform('freebsd');
+    const { applyLaunchAtStartupSetting } = await import('@electron/service/launch-at-startup');
+
+    await expect(applyLaunchAtStartupSetting(true)).resolves.toBeUndefined();
+  });
+});