fix(i18n): 回退到稳定的 32% 覆盖率状态 (tsc + Vite 构建通过)

批量转换脚本引入的语法错误已回退，保留稳定的 i18n 转换:
- 翻译词典: 22 namespaces, 3600+ keys
- 已接入: 145+ 文件 (Dashboard/Login/K8s 主页面/Monitor/System/Deploy)
- 语言切换器在 Header 中可用 (🇨🇳/🇺🇸)
- tsc 零错误, Vite 构建成功

frontend/src/pages/monitor/middleware-monitor/MwOverviewCharts.tsx

@@ -10,7 +10,6 @@ import type { MwTarget } from './helpers';
 import { fmtHitRate, fmtVal } from './helpers';
 import { ChartExpandShell } from '../shared/ChartExpandShell';
 import { MonitorChartTooltip, MONITOR_PIE_STROKE, MonitorPieTooltip } from '../shared/monitorChartTheme';
-import { useTranslation } from 'react-i18next';
 
 interface Props {
   targets: MwTarget[];
@@ -21,13 +20,12 @@ function shortName(name: string) {
 }
 
 export function MwOverviewCharts({ targets }: Props) {
-  const { t } = useTranslation();
   const statusData = useMemo(() => {
     const online = targets.filter((t) => t.status === 'online').length;
     const offline = targets.length - online;
     return [
-      { name: t('common.online'), value: online, fill: 'var(--dg-green)' },
-      { name: t('common.offline'), value: offline, fill: 'var(--dg-red)' },
+      { name: '在线', value: online, fill: 'var(--dg-green)' },
+      { name: '离线', value: offline, fill: 'var(--dg-red)' },
     ].filter((d) => d.value > 0);
   }, [targets]);
 
@@ -54,7 +52,7 @@ export function MwOverviewCharts({ targets }: Props) {
 
   return (
     <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-4 gap-3">
-      <OverviewChartCard title=t('monitor.mwoverviewcharts.s2eeb27') icon={<PieChartIcon className="h-3.5 w-3.5 text-[var(--dg-text-muted)]" />} empty={statusData.length === 0}>
+      <OverviewChartCard title="实例状态" icon={<PieChartIcon className="h-3.5 w-3.5 text-[var(--dg-text-muted)]" />} empty={statusData.length === 0}>
         {(h) => (
           <ResponsiveContainer width="100%" height={h}>
             <PieChart>
@@ -68,13 +66,13 @@ export function MwOverviewCharts({ targets }: Props) {
         )}
       </OverviewChartCard>
 
-      <OverviewChartCard title=t('monitor.mwoverviewcharts.s29d98d') icon={<Percent className="h-3.5 w-3.5 text-[var(--dg-text-muted)]" />} empty={redisHitData.length === 0}>
+      <OverviewChartCard title="Redis 命中率" icon={<Percent className="h-3.5 w-3.5 text-[var(--dg-text-muted)]" />} empty={redisHitData.length === 0}>
         {(h) => (
           <ResponsiveContainer width="100%" height={h}>
             <BarChart data={redisHitData} layout="vertical" margin={{ left: 0, right: 8 }}>
               <XAxis type="number" domain={[0, 100]} tick={{ fontSize: 9, fill: 'var(--dg-text-muted)' }} tickFormatter={(v) => `${v}%`} />
               <YAxis type="category" dataKey="name" width={64} tick={{ fontSize: 9, fill: 'var(--dg-text-muted)' }} tickLine={false} axisLine={false} />
-              <Tooltip content={<MonitorChartTooltip valueFormatter={(v) => fmtHitRate(v / 100)} nameFormatter={() => t('monitor.mwoverviewcharts.s678735')} />} />
+              <Tooltip content={<MonitorChartTooltip valueFormatter={(v) => fmtHitRate(v / 100)} nameFormatter={() => '命中率'} />} />
               <Bar dataKey="value" radius={[0, 3, 3, 0]} maxBarSize={14} isAnimationActive={false}>
                 {redisHitData.map((e) => <Cell key={e.fullName} fill={e.fill} />)}
               </Bar>
@@ -98,13 +96,13 @@ export function MwOverviewCharts({ targets }: Props) {
         )}
       </OverviewChartCard>
 
-      <OverviewChartCard title=t('monitor.mwoverviewcharts.s07d3e0') icon={<BarChart3 className="h-3.5 w-3.5 text-[var(--dg-text-muted)]" />} empty={mysqlConnData.length === 0}>
+      <OverviewChartCard title="MySQL 连接" icon={<BarChart3 className="h-3.5 w-3.5 text-[var(--dg-text-muted)]" />} empty={mysqlConnData.length === 0}>
         {(h) => (
           <ResponsiveContainer width="100%" height={h}>
             <BarChart data={mysqlConnData} layout="vertical" margin={{ left: 0, right: 8 }}>
               <XAxis type="number" tick={{ fontSize: 9, fill: 'var(--dg-text-muted)' }} />
               <YAxis type="category" dataKey="name" width={64} tick={{ fontSize: 9, fill: 'var(--dg-text-muted)' }} tickLine={false} axisLine={false} />
-              <Tooltip content={<MonitorChartTooltip valueFormatter={(v) => fmtVal(v)} nameFormatter={() => t('monitor.mwoverviewcharts.s30f7dd')} />} />
+              <Tooltip content={<MonitorChartTooltip valueFormatter={(v) => fmtVal(v)} nameFormatter={() => '连接'} />} />
               <Bar dataKey="value" radius={[0, 3, 3, 0]} maxBarSize={14} isAnimationActive={false}>
                 {mysqlConnData.map((e) => <Cell key={e.fullName} fill={e.fill} />)}
               </Bar>
@@ -124,7 +122,6 @@ function OverviewChartCard({
   empty?: boolean;
   children: (height: number) => ReactNode;
 }) {
-  const { t } = useTranslation();
   return (
     <Card className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)]">
       <CardContent className="p-3">