refactor(i18n): U41 残余硬编码中文清零 — 工具函数+审计RDP标签+AIOps分析+Monitor残余+审批选项

18 文件 ~35 处 UI 硬编码中文→t()/i18n.t() 调用:
- agent-utils.ts timeAgo() 秒前/分钟前/小时前
- utils.ts formatDistanceToNow() 分钟前/小时前/天前
- request.ts 响应解析失败错误消息
- ActiveSessionsPanel/HistorySessionsPanel RDP 在线/历史会话标签
- MetricsExplorer 清除/已选/最近1小时
- HostMonitor 当前主机 subtitle
- AIAnalysisResult 证据链 (新增 useTranslation hook)
- capacity-predict.ts 容量预测摘要模板
- ApprovalResourcePage 阿里云/腾讯云/华为云
- ApprovalPermissionPage 堡垒机
- site-monitor/helpers.ts 频率/时间/证书天数格式化
- site-monitor/analytics.ts 证书剩余/检查失败/延迟波动事件
- middleware-monitor MwTargetChartsPanel/MwTrendChart/helpers.ts
- snmp-monitor SnmpMetricTrendChart/SnmpDeviceChartsPanel
- host-monitor/utils.ts 图表点数标签 + PortPolicyDialog 系统进程说明

新增 34 翻译键 (common.duration.secAgo/hourAgo/dayAgo + common.selected/
responseParseError/rdpActiveSessions/rdpHistorySessions/rdpSessionCount/
evidenceChain/last1Hour/currentHost + monitor.lbl 10键 + monitor.siteMonitor
8键 + approval.provider 3键 + approval.permType 1键 +
monitor.portPolicyDialog.systemProcessDesc + aiops.capacity.summary)

zh/en 7813→7847 对齐; tsc -b=0, npm build✓ (17.31s), ESLint=0/43/any=0,
go build=0, 17/17 测试通过

frontend/src/lib/agent-utils.ts

@@ -1,4 +1,5 @@
 import type { JsonData } from "@/types/common";
+import i18n from "@/i18n";
 // Agent 监控相关工具函数（供组件与 API 层共享） // Logan.Li
 
 /** 在线判定：3 分钟内有上报视为在线 */
@@ -15,9 +16,9 @@ export function timeAgo(ts: unknown): string {
   const t = new Date(ts as string | number | Date).getTime();
   if (Number.isNaN(t)) return '--';
   const diff = Math.floor((Date.now() - t) / 1000);
-  if (diff < 60) return `${diff}秒前`;
-  if (diff < 3600) return `${Math.floor(diff / 60)}分钟前`;
-  if (diff < 86400) return `${Math.floor(diff / 3600)}小时前`;
+  if (diff < 60) return i18n.t('common.duration.secAgo', { count: diff });
+  if (diff < 3600) return i18n.t('common.duration.minAgo', { count: Math.floor(diff / 60) });
+  if (diff < 86400) return i18n.t('common.duration.hourAgo', { count: Math.floor(diff / 3600) });
   return new Date(ts as string | number | Date).toLocaleString();
 }
 

frontend/src/lib/utils.ts

@@ -18,11 +18,11 @@ export function formatDistanceToNow(timestamp: number): string {
   if (seconds < 60) {
     return i18n.t('task.cronJob.time.justNow');
   } else if (minutes < 60) {
-    return `${minutes}分钟前`;
+    return i18n.t('common.duration.minAgo', { count: minutes });
   } else if (hours < 24) {
-    return `${hours}小时前`;
+    return i18n.t('common.duration.hourAgo', { count: hours });
   } else if (days < 30) {
-    return `${days}天前`;
+    return i18n.t('common.duration.dayAgo', { count: days });
   } else {
     return new Date(timestamp).toLocaleDateString();
   }