refactor(i18n): U43 深度残余硬编码中文 UI 文本清零 — 17 文件 ~40 处→0

趋势标签(上升/下降/平稳) + K8s 卡片标题(Pod级别/安全上下文/实例/详情) + data-table 默认值(搜索/暂无数据) + Deployment 编辑器标签(数据卷/挂载/只读写/manifest提示/镜像拉取凭证) + HostSettings 4 个命名空间描述 + 7 个 K8s 页面刷新按钮 + 资源编辑器新建/编辑 + Agent 执行命令描述 + 账单保存成功 toast + 容量预警标题

新增 common 30 语义化翻译键, zh/en 7898→7928 对齐
tsc -b=0, npm build✓ (16.55s), ESLint=0/43/any=0, go build=0, 17/17 测试通过

frontend/src/components/agent/HostDetailDialog.tsx

@@ -102,7 +102,7 @@ export function HostDetailDialog({
             <div className="flex items-center justify-between mb-2">
               <span className="text-sm font-medium text-[var(--dg-text-primary)] flex items-center gap-1.5">
                 <Activity className="h-4 w-4 dg-text-blue" />
-                指标趋势
+                {i18n.t('common.metricTrend')}
               </span>
               <Select value={String(hours)} onValueChange={(v) => setHours(Number(v))}>
                 <SelectTrigger size="sm" className="h-7 w-28 dg-input text-[var(--dg-text-secondary)] text-xs">
@@ -158,7 +158,7 @@ export function HostDetailDialog({
           <div>
             <span className="text-sm font-medium text-[var(--dg-text-primary)] flex items-center gap-1.5 mb-2">
               <Network className="h-4 w-4 dg-text-blue" />
-              端口发现 ({ports.length})
+              {i18n.t('common.portDiscovery', { count: ports.length })}
             </span>
             {ports.length === 0 ? (
               <p className="text-xs dg-text-muted"> {i18n.t('agent.hostDetailDialog.noPortData')} </p>
@@ -181,10 +181,10 @@ export function HostDetailDialog({
             className="bg-blue-600 hover:bg-blue-700 text-white"
           >
             <Terminal className="h-4 w-4 mr-1.5" />
-            远程命令
+            {i18n.t('common.remoteCommand')}
           </Button>
           <Button variant="outline" onClick={onClose} className="border-[var(--dg-border)] text-[var(--dg-text-secondary)]">
-            关闭
+            {i18n.t('common.close')}
           </Button>
         </DialogFooter>
       </DialogContent>