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/components/aiops/AIAnalysisResult.tsx

@@ -4,6 +4,7 @@ import { Button } from '@/components/ui/button';
 import { ScrollArea } from '@/components/ui/scroll-area';
 import { Sparkles, Brain, Loader2 } from 'lucide-react';
 import { AlertCircle, TrendingUp, CheckCircle, FileText, Terminal, Play } from 'lucide-react';
+import { useTranslation } from 'react-i18next';
 import type { AlertItem, AIAnalysis } from './analyzerHelpers';
 import i18n from '@/i18n';
 
@@ -15,6 +16,7 @@ interface AIAnalysisResultProps {
 }
 
 export function AIAnalysisResult({ selectedAlert, isAnalyzing, analysis, onAutoFix }: AIAnalysisResultProps) {
+  const { t } = useTranslation();
   return (
     <Card className="dg-card flex flex-col">
       <CardHeader className="border-b border-[var(--dg-border)] pb-3">
@@ -91,7 +93,7 @@ export function AIAnalysisResult({ selectedAlert, isAnalyzing, analysis, onAutoF
                 <div className="space-y-2">
                   <h4 className="text-sm font-medium text-[var(--dg-text-secondary)] flex items-center gap-2">
                     <FileText className="h-4 w-4 dg-text-blue" />
-                    证据链
+                    {t('common.evidenceChain')}
                   </h4>
                   <div className="space-y-2">
                     {analysis.evidence.slice(0, 5).map((item, idx) => (

frontend/src/components/aiops/capacity-predict.ts

@@ -178,7 +178,7 @@ export function buildCapacityInsightPrompt(forecasts: CapacityForecast[]): strin
   if (forecasts.length === 0) return '';
   const lines = forecasts.map((f) => {
     const risk = f.daysUntilThreshold >= 999 ? i18n.t('aiops.capacity.noRisk') : i18n.t('aiops.predictutilsts.daysUntilThreshold', { days: f.daysUntilThreshold });
-    return `- ${f.resource}：当前 ${f.currentUsage}% → 7天后预测 ${f.predictedUsage}%（阈值 ${f.threshold}%），${risk}`;
+    return i18n.t('aiops.capacity.summary', { resource: f.resource, current: f.currentUsage, predicted: f.predictedUsage, threshold: f.threshold, risk });
   });
   return [
     i18n.t('aiops.capacity.expertPrompt'),