refactor: 迁移 i18n 系统从 react-i18next 到 chrome.i18n

- 移除 react-i18next、i18next 及相关依赖
- 删除旧的 i18n/ 目录和 useLazyTranslation 工具
- 新增 utils/chromeI18n.ts 类型安全 wrapper（useI18n Hook + getMessage）
- 生成 public/_locales/{zh,en}/messages.json（298 个翻译 key）
- 批量更新 39+ 组件文件的导入和翻译调用
- 转换翻译键格式：namespace:key → namespace_key
- 修复 ErrorBoundary/PageErrorBoundary 从 withTranslation HOC 改为直接调用 getMessage
- 更新 vitest.setup.ts mock 加载实际翻译文本
- 修复 11 个测试文件的断言以匹配中文翻译
- TypeScript、ESLint、547 项测试全部通过

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

pages/RightClickRestorer/__tests__/index.test.tsx

@@ -26,7 +26,7 @@ describe('RightClickRestorerPage', () => {
 
   it('should render locked status', () => {
     render(<RightClickRestorerPage />);
-    expect(screen.getByText(/statusLocked/)).toBeInTheDocument();
+    expect(screen.getByText(/未解锁/)).toBeInTheDocument();
   });
 
   it('should call unlock when button clicked', () => {

pages/RightClickRestorer/index.tsx

@@ -3,10 +3,10 @@ import { Label } from '@/components/ui/label';
 import { Badge } from '@/components/ui/badge';
 import { Shield, ShieldCheck, MousePointerClick, AlertTriangle } from 'lucide-react';
 import { useRightClickRestorer } from './useRightClickRestorer';
-import { useLazyTranslation } from '@/utils/useLazyTranslation';
+import { useI18n } from '@/utils/chromeI18n';
 
 export default function RightClickRestorerPage() {
-  const { t } = useLazyTranslation('rightClickRestorer');
+  const { t } = useI18n('rightClickRestorer');
   const { domain, isLoading, isUnlocked, isUnsupported, unlock } = useRightClickRestorer();
 
   if (isLoading) {