feat(i18n): 安全批量转换 135 文件 — 覆盖率 34%→62%

使用 i18n.t() 全局方式（避免 hook 定位问题）:
- 288 目标文件中 135 个成功转换
- 2228 处中文替换为 i18n.t() 调用
- 1006 个新翻译 key 添加到 zh-CN.json + en-US.json
- 词典总量: 3554 keys (22 namespaces)
- tsc 零错误 + Vite 构建成功
- 6 个含代码示例/数据字符串的文件安全回退

frontend/src/components/ui/confirm-dialog.tsx

@@ -5,6 +5,7 @@ import {
   DialogDescription, DialogFooter,
 } from '@/components/ui/dialog';
 import { Button } from '@/components/ui/button';
+import i18n from '@/i18n';
 
 interface ConfirmOptions {
   title?: string;
@@ -29,23 +30,23 @@ export function useConfirm() {
 export function ConfirmProvider({ children }: { children: ReactNode }) {
   const [open, setOpen] = useState(false);
   const [options, setOptions] = useState<Required<ConfirmOptions>>({
-    title: '确认操作',
+    title: i18n.t('common.confirmOp'),
     description: '',
-    confirmText: '确认',
-    cancelText: '取消',
+    confirmText: i18n.t('monitor.alertEvents.acknowledge'),
+    cancelText: i18n.t('rbac.jobRole.cancel'),
     variant: 'default',
   });
   const [resolver, setResolver] = useState<((v: boolean) => void) | null>(null);
 
   const confirm = useCallback((opts: ConfirmOptions | string) => {
     const normalized = typeof opts === 'string'
-      ? { title: '确认操作', description: opts }
+      ? { title: i18n.t('common.confirmOp'), description: opts }
       : opts;
     setOptions({
-      title: normalized.title || '确认操作',
+      title: normalized.title || i18n.t('common.confirmOp'),
       description: normalized.description || '',
-      confirmText: normalized.confirmText || '确认',
-      cancelText: normalized.cancelText || '取消',
+      confirmText: normalized.confirmText || i18n.t('monitor.alertEvents.acknowledge'),
+      cancelText: normalized.cancelText || i18n.t('rbac.jobRole.cancel'),
       variant: (normalized.variant || 'default') as 'default' | 'destructive',
     });
     setOpen(true);