✨ feat(i18n): 完善多模块多语言适配与发版验证

扩展前后端多语言文案与共享词典。增加多模块 i18n 回归测试与 guard。收口外部 SQL 菜单和弹窗多语言文案。

frontend/src/components/SecurityUpdateIntroModal.i18n.test.tsx

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+import { readFileSync } from 'node:fs';
+import React from 'react';
+import { act, create } from 'react-test-renderer';
+import { describe, expect, it, vi } from 'vitest';
+import { I18nProvider } from '../i18n/provider';
+import type { OverlayWorkbenchTheme } from '../utils/overlayWorkbenchTheme';
+import SecurityUpdateIntroModal from './SecurityUpdateIntroModal';
+
+vi.mock('../i18n/runtime', () => ({
+  syncLanguageRuntime: vi.fn(async () => undefined),
+}));
+
+vi.mock('antd', async () => {
+  const React = await import('react');
+  return {
+    Button: ({
+      children,
+    }: {
+      children?: React.ReactNode;
+    }) => React.createElement('button', null, children),
+    Modal: ({
+      children,
+      footer,
+      open,
+      title,
+    }: {
+      children?: React.ReactNode;
+      footer?: React.ReactNode;
+      open?: boolean;
+      title?: React.ReactNode;
+    }) => (open ? React.createElement('section', null, title, footer, children) : null),
+  };
+});
+
+vi.mock('@ant-design/icons', async () => {
+  const React = await import('react');
+  return {
+    SafetyCertificateOutlined: () => React.createElement('span', null, 'certificate'),
+  };
+});
+
+const source = readFileSync(new URL('./SecurityUpdateIntroModal.tsx', import.meta.url), 'utf8');
+
+const overlayTheme: OverlayWorkbenchTheme = {
+  isDark: false,
+  shellBg: '#fff',
+  shellBorder: '1px solid #eee',
+  shellShadow: 'none',
+  shellBackdropFilter: 'none',
+  sectionBg: '#fff',
+  sectionBorder: '1px solid #eee',
+  mutedText: '#666',
+  titleText: '#111',
+  iconBg: '#f5f5f5',
+  iconColor: '#1677ff',
+  hoverBg: '#f5f5f5',
+  selectedBg: '#e6f4ff',
+  selectedText: '#1677ff',
+  divider: '#eee',
+};
+
+const renderIntroModalText = async () => {
+  let renderer: ReturnType<typeof create>;
+
+  await act(async () => {
+    renderer = create(
+      <I18nProvider
+        preference="en-US"
+        systemLanguages={['en-US']}
+        onPreferenceChange={() => undefined}
+      >
+        <SecurityUpdateIntroModal
+          open
+          darkMode={false}
+          overlayTheme={overlayTheme}
+          onStart={() => undefined}
+          onPostpone={() => undefined}
+          onViewDetails={() => undefined}
+        />
+      </I18nProvider>,
+    );
+  });
+
+  return JSON.stringify(renderer!.toJSON());
+};
+
+describe('SecurityUpdateIntroModal i18n source guards', () => {
+  it('uses intro i18n keys instead of legacy Chinese shell copy', () => {
+    expect(source).toContain('security_update.intro.title');
+    expect(source).toContain('security_update.intro.description');
+    expect(source).toContain('security_update.intro.action.start_now');
+    expect(source).not.toContain('已保存配置安全更新');
+    expect(source).not.toContain('使用新的安全存储方式前，需要先完成一次本地配置更新。');
+    expect(source).not.toContain('查看详情');
+    expect(source).not.toContain('稍后提醒我');
+    expect(source).not.toContain('立即更新');
+    expect(source).not.toContain('为了让已保存的连接、代理和相关服务配置使用新的安全存储方式');
+  });
+
+  it('localizes the intro modal chrome in English', async () => {
+    const modalText = await renderIntroModalText();
+    expect(modalText).toContain('Saved Configuration Security Update');
+    expect(modalText).toContain('Complete a local configuration update before using the new secure storage.');
+    expect(modalText).toContain('View Details');
+    expect(modalText).toContain('Remind Me Later');
+    expect(modalText).toContain('Update Now');
+    expect(modalText).toContain('To move saved connections, proxy settings, and related service configuration to the new secure storage');
+  });
+});