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/agent/HostDetailDialog.tsx

@@ -30,6 +30,7 @@ import {
   ResponsiveContainer,
 } from 'recharts';
 import type { JsonData } from '@/types/common';
+import i18n from '@/i18n';
 
 export function HostDetailDialog({
   host,
@@ -78,21 +79,21 @@ export function HostDetailDialog({
             <Server className="h-5 w-5 dg-text-blue" />
             {host.hostname}
             {online ? (
-              <Badge className="bg-emerald-500/15 dg-text-green border border-emerald-500/30">在线</Badge>
+              <Badge className="bg-emerald-500/15 dg-text-green border border-emerald-500/30"> {i18n.t('agent.agentOnline')} </Badge>
             ) : (
-              <Badge className="bg-red-500/15 dg-text-red border border-red-500/30">离线</Badge>
+              <Badge className="bg-red-500/15 dg-text-red border border-red-500/30"> {i18n.t('agent.agentOffline')} </Badge>
             )}
           </DialogTitle>
-          <DialogDescription className="sr-only">查看主机详情和指标趋势</DialogDescription>
+          <DialogDescription className="sr-only"> {i18n.t('agent.hostdetaildialo.sffa4f720')} </DialogDescription>
         </DialogHeader>
 
         <div className="space-y-4">
           {/* 基本信息 */}
           <div className="grid grid-cols-2 md:grid-cols-4 gap-3 text-sm">
-            <InfoCell label="IP 地址" value={host.ip || '--'} />
-            <InfoCell label="操作系统" value={host.os || host.platform || '--'} />
-            <InfoCell label="最后上报" value={timeAgo(host.last_report || host.last_reported_at || host.updated_at)} />
-            <InfoCell label="端口数" value={String(ports.length)} />
+            <InfoCell label={i18n.t('agent.agentIp')} value={host.ip || '--'} />
+            <InfoCell label={i18n.t('agent.agentOs')} value={host.os || host.platform || '--'} />
+            <InfoCell label={i18n.t('agent.agentLastSeen')} value={timeAgo(host.last_report || host.last_reported_at || host.updated_at)} />
+            <InfoCell label={i18n.t('agent.hostdetaildialo.s6ad4fc6e')} value={String(ports.length)} />
           </div>
 
           {/* 趋势图 */}
@@ -107,9 +108,9 @@ export function HostDetailDialog({
                   <SelectValue />
                 </SelectTrigger>
                 <SelectContent className="dg-input">
-                  <SelectItem value="1">最近 1 小时</SelectItem>
-                  <SelectItem value="6">最近 6 小时</SelectItem>
-                  <SelectItem value="24">最近 24 小时</SelectItem>
+                  <SelectItem value="1"> {i18n.t('agent.hostdetaildialo.s3851af2c')} </SelectItem>
+                  <SelectItem value="6"> {i18n.t('agent.hostdetaildialo.s2d59b172')} </SelectItem>
+                  <SelectItem value="24"> {i18n.t('agent.hostdetaildialo.s768a1b34')} </SelectItem>
                 </SelectContent>
               </Select>
             </div>
@@ -119,7 +120,7 @@ export function HostDetailDialog({
                   <Loader2 className="h-5 w-5 animate-spin dg-text-muted" />
                 </div>
               ) : chartData.length === 0 ? (
-                <div className="h-full flex items-center justify-center text-sm dg-text-muted">暂无历史数据</div>
+                <div className="h-full flex items-center justify-center text-sm dg-text-muted"> {i18n.t('agent.hostdetaildialo.sdc73dbe9')} </div>
               ) : (
                 <ResponsiveContainer width="100%" height="100%">
                   <AreaChart data={chartData} margin={{ top: 5, right: 5, bottom: 0, left: -20 }}>
@@ -144,8 +145,8 @@ export function HostDetailDialog({
                       contentStyle={{ backgroundColor: '#0f172a', border: '1px solid #1e293b', borderRadius: '6px', color: '#f8fafc', fontSize: '12px' }}
                     />
                     <Area type="monotone" dataKey="cpu" stroke="#3b82f6" fill="url(#gCpu)" name="CPU" />
-                    <Area type="monotone" dataKey="mem" stroke="#10b981" fill="url(#gMem)" name="内存" />
-                    <Area type="monotone" dataKey="disk" stroke="#f59e0b" fill="url(#gDisk)" name="磁盘" />
+                    <Area type="monotone" dataKey="mem" stroke="#10b981" fill="url(#gMem)" name={i18n.t('kubernetes.pod.memory')} />
+                    <Area type="monotone" dataKey="disk" stroke="#f59e0b" fill="url(#gDisk)" name={i18n.t('monitor.dashboard.col.disk')} />
                   </AreaChart>
                 </ResponsiveContainer>
               )}
@@ -159,7 +160,7 @@ export function HostDetailDialog({
               端口发现 ({ports.length})
             </span>
             {ports.length === 0 ? (
-              <p className="text-xs dg-text-muted">暂无端口数据</p>
+              <p className="text-xs dg-text-muted"> {i18n.t('agent.hostdetaildialo.se7887d60')} </p>
             ) : (
               <div className="flex flex-wrap gap-1.5 max-h-32 overflow-y-auto">
                 {ports.map((p, idx) => (