feat(i18n): 剩余模块全量国际化 — 51% 覆盖率 (231 文件接入 t())

批量转换 163 个文件，3204 处中文替换为 t() 调用：
- Monitor: 日志中心/告警中心/数据源/大屏/站点拨测/SNMP/中间件 全部转换
- Kubernetes: ResourceVisualEditor/NamespaceResourcePage/拓扑/事件 全部转换
- Deploy: 流水线/发布/凭证/RBAC 全部转换
- Server/Cloud/Agent/Task/Layout/UI: 全部转换
- 翻译词典扩展至 6474 行 (22 namespaces, 5000+ keys)
- tsc 编译零错误

frontend/src/components/cloud/CloudBillingHelpers.tsx

@@ -1,12 +1,14 @@
 import { type ReactNode } from 'react';
 import { TrendingUp, TrendingDown } from 'lucide-react';
+import { useTranslation } from 'react-i18next';
+import i18n from '@/i18n';
 
 // 云厂商中文标签（主组件 + 弹窗共享） // Logan.Li
 export const providerLabels: Record<string, string> = {
-  aliyun: '阿里云',
-  tencent: '腾讯云',
+  aliyun: i18n.t('cloud.aliyun'),
+  tencent: i18n.t('cloud.tencent'),
   aws: 'AWS',
-  huawei: '华为云',
+  huawei: i18n.t('cloud.huawei'),
   azure: 'Azure',
 };
 
@@ -29,6 +31,7 @@ export const providerColors: Record<string, string> = {
 };
 
 export function ProviderDot({ provider, className = 'w-2 h-2' }: { provider: string; className?: string }) {
+  const { t } = useTranslation();
   return (
     <span
       className={`rounded-full shrink-0 ${className}`}
@@ -49,6 +52,7 @@ export function StatCard({ icon, label, value, trend, trendLabel, alert }: {
   trendLabel?: string;
   alert?: boolean;
 }) {
+  const { t } = useTranslation();
   return (
     <div className={alert ? 'dg-alert-banner' : 'rounded-lg border border-[var(--border-default)] bg-[var(--surface-raised)]/50 p-4'}>
       <div className="flex items-center justify-between mb-2">
@@ -68,8 +72,9 @@ export function StatCard({ icon, label, value, trend, trendLabel, alert }: {
 }
 
 export function TrendChart({ data }: { data: { date: string; cost: number }[] }) {
+  const { t } = useTranslation();
   if (data.length === 0) {
-    return <p className="text-sm dg-text-muted py-8 text-center">暂无数据</p>;
+    return <p className="text-sm dg-text-muted py-8 text-center">{t('common.noData')}</p>;
   }
   const max = Math.max(...data.map((d) => d.cost), 1);
   const recent = data.slice(-30);