refactor(i18n): U29 phantom key 全项目清零 — 28 个 phantom key → 0

AlertRuleDialog.tsx (9处) + DeployTargetFields.tsx (3处) + HealthProbeSection.tsx (2处+1处硬编码) + PodLogsViewer.tsx (2处终端ANSI字符串) + AlertChannelDialog.tsx (2处) + PodMetricsPage.tsx/CapacityPage.tsx (各1处) + PodExecTerminal.tsx (1处终端ANSI) + BuildNodesManager.tsx (1处) + HostDetailDialog.tsx (1处)

修复类型:
- 批量正则损坏的 i18n.t('>中文 <span className=') → 语义化键
- 终端 ANSI 转义字符串 (PodLogsViewer/PodExecTerminal) → 移除 i18n.t() 包裹改纯字符串
- 硬编码中文 (取消/通知渠道提示/日志数据源提示) → i18n.t() 调用

新增 16 个翻译键 (monitor.alertRuleDialog2.* + monitor.alertChannel.name + agent.portCount + monitor.lbl.noProbeHint)
zh/en 7358→7375 +17 键对齐
phantom key 28→0 (全项目零 phantom key)
tsc -b=0, npm build✓ (17.00s), ESLint=0/53/0, go build=0, 17/17 测试通过

frontend/src/pages/monitor/host-monitor/HealthProbeSection.tsx

@@ -103,7 +103,7 @@ export function HealthProbeSection({ selectedHost }: HealthProbeSectionProps) {
         {probes.length === 0 ? (
           <Card className="bg-[var(--dg-bg-secondary)] border-dashed border-[var(--dg-border)]">
             <CardContent className="p-8 text-center text-xs text-[var(--dg-text-muted)]">
-              暂无健康探针，点击t('monitor.lbl.addProbe')创建
+              {t('monitor.lbl.noProbeHint', { action: t('monitor.lbl.addProbe') })}
             </CardContent>
           </Card>
         ) : (
@@ -168,7 +168,7 @@ export function HealthProbeSection({ selectedHost }: HealthProbeSectionProps) {
           </DialogHeader>
           <div className="space-y-3 max-h-[60vh] overflow-y-auto pr-1">
             <div>
-              <label className="text-[11px] text-[var(--dg-text-muted)] mb-1 block"> {t('>探针名称 <span className=')} <span className="dg-text-red">*</span></label>
+              <label className="text-[11px] text-[var(--dg-text-muted)] mb-1 block"> {t('monitor.lbl.probeName')} <span className="dg-text-red">*</span></label>
               <input className="w-full h-8 bg-[var(--dg-bg-secondary)] border border-[var(--dg-border)] rounded px-2 text-xs text-[var(--dg-text-primary)]" value={probeForm.name} onChange={e => setProbeForm({ ...probeForm, name: e.target.value })} placeholder={t('monitor.healthProbe.namePlaceholder')} />
             </div>
             <div>
@@ -214,7 +214,7 @@ export function HealthProbeSection({ selectedHost }: HealthProbeSectionProps) {
             <div className="grid grid-cols-2 gap-2">
               <div><label className="text-[11px] text-[var(--dg-text-muted)] mb-1 block"> {t('automation.remoteTimeout')} </label>
                 <input type="number" className="w-full h-8 bg-[var(--dg-bg-secondary)] border border-[var(--dg-border)] rounded px-2 text-xs text-[var(--dg-text-primary)]" value={probeForm.timeout} onChange={e => setProbeForm({ ...probeForm, timeout: Number(e.target.value) })} /></div>
-              <div><label className="text-[11px] text-[var(--dg-text-muted)] mb-1 block"> {t('>执行命令 <span className=')} </label>
+              <div><label className="text-[11px] text-[var(--dg-text-muted)] mb-1 block"> {t('monitor.lbl.execCommand')} </label>
                 <input type="number" className="w-full h-8 bg-[var(--dg-bg-secondary)] border border-[var(--dg-border)] rounded px-2 text-xs text-[var(--dg-text-primary)]" value={probeForm.interval} onChange={e => setProbeForm({ ...probeForm, interval: Number(e.target.value) })} /></div>
             </div>