feat(i18n): 全量中英文国际化改造

- 翻译 en-US.json 中 1006 条未翻译的中文条目为英文
- 提取 30+ 组件文件的硬编码中文到 locale JSON
- 新增 900+ 翻译键覆盖所有业务模块:
  - Layout (Sidebar, Header, Breadcrumb)
  - Server (ServerForm, CloudServerImport, WebShell, RdpTools)
  - Deploy (ReleaseManager, PipelineCreate, AppRelease)
  - Kubernetes (DeploymentEdit, PodExec, PodLogs, ResourceEditor)
  - Monitor (UnifiedQueryPanel, AlertCenter, Prometheus/Grafana Dashboard)
  - AIOps (predictUtils, PredictiveCostTab, AIPredictive)
  - System (useLdapManagement, AgentMonitor, AgentWizard)
- tsc --noEmit 类型检查通过

frontend/src/pages/monitor/HostMonitor.tsx

@@ -137,7 +137,7 @@ export function HostMonitor({ embedded = false }: { embedded?: boolean }) {
         </Select>
         {serverInfo && (
           <span className="text-xs dg-text-muted">
-            {String(serverInfo.os || '')}{serverInfo.cpu_cores ? ` | ${serverInfo.cpu_cores as number | string} 核` : ''}{serverInfo.mem_total ? ` | ${(serverInfo.mem_total as number).toFixed(0)}GB` : ''}
+            {String(serverInfo.os || '')}{serverInfo.cpu_cores ? ` | ${serverInfo.cpu_cores as number | string} ${i18n.t('monitor.hostMonitorPanel.cores')}` : ''}{serverInfo.mem_total ? ` | ${(serverInfo.mem_total as number).toFixed(0)}GB` : ''}
           </span>
         )}
       </div>
@@ -155,7 +155,7 @@ export function HostMonitor({ embedded = false }: { embedded?: boolean }) {
         <div className="flex flex-col items-end gap-0.5">
           <HostTimeRangePicker value={timeRange} onChange={setTimeRange} />
           {actualDataSpan && (
-            <span className="text-[10px] dg-text-muted tabular-nums">数据 {actualDataSpan}</span>
+            <span className="text-[10px] dg-text-muted tabular-nums">{i18n.t('monitor.hostMonitorPanel.dataSpan', { span: actualDataSpan })}</span>
           )}
         </div>
       </div>
@@ -218,7 +218,7 @@ export function HostMonitor({ embedded = false }: { embedded?: boolean }) {
         <TabsContent value="network" className="mt-3 space-y-3">
           <div className="grid grid-cols-1 md:grid-cols-4 gap-3">
             <MetricChartCard title="TCP EST" value={currentVal('tcp')} icon={<Network />} iconTone="purple"
-              data={metrics.tcpEst} color="#8b5cf6" unit="个" domain={[0, 'auto']} aggType={aggType} />
+              data={metrics.tcpEst} color="#8b5cf6" unit={i18n.t('monitor.hostMonitorPanel.portUnit')} domain={[0, 'auto']} aggType={aggType} />
             <MetricChartCard title="TCP TIME_WAIT" value={currentVal('tw')} icon={<Clock />} iconTone="yellow"
               data={metrics.tcpTW} color="#f59e0b" unit="个" domain={[0, 'auto']} aggType={aggType} />
             <MetricChartCard title="TCP CLOSE_WAIT" value={netInfo?.tcp_close_wait != null ? String(netInfo.tcp_close_wait) : '--'} icon={<Clock />} iconTone="red"