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/locales/en-US.json

@@ -181,7 +181,10 @@
       "minSec": "{{m}}m {{s}}s",
       "hour": "{{count}}h",
       "hourMin": "{{h}}h {{m}}m",
-      "minAgo": "{{count}} min ago"
+      "minAgo": "{{count}} min ago",
+      "secAgo": "{{count}}s ago",
+      "hourAgo": "{{count}}h ago",
+      "dayAgo": "{{count}}d ago"
     },
     "ebCaughtError": "[ErrorBoundary] Caught error:",
     "ebCopyError": "Copy Error",
@@ -623,7 +626,15 @@
     "fillIfMultiContainer": "(required for multi-container)",
     "confirmDeleteType": "Delete {{type}} \"{{name}}\"?",
     "unitCount": "",
-    "fieldValues": "{{count}} values"
+    "fieldValues": "{{count}} values",
+    "selected": "{{count}} selected",
+    "responseParseError": "Response parse failed",
+    "rdpActiveSessions": "RDP Active Sessions",
+    "rdpHistorySessions": "RDP History Sessions",
+    "rdpSessionCount": "RDP sessions: {{count}}",
+    "evidenceChain": "Evidence Chain",
+    "last1Hour": "Last 1 hour",
+    "currentHost": "Current host: {{host}}"
   },
   "menu": {
     "aiAgentCli": "Agent CLI",
@@ -1478,7 +1489,15 @@
       "general": "General Approval"
     },
     "workflowSubtitle": "Configure multi-level approval workflows for resource, application, and permission requests",
-    "workflowTitle": "Approval Workflow Config"
+    "workflowTitle": "Approval Workflow Config",
+    "provider": {
+      "aliyun": "Alibaba Cloud",
+      "tencent": "Tencent Cloud",
+      "huawei": "Huawei Cloud"
+    },
+    "permType": {
+      "bastion": "Bastion"
+    }
   },
   "audit": {
     "csvHeader": "Time,User,Command,Output Size,Session ID,Critical",
@@ -4423,7 +4442,16 @@
       "snmpVersion": "SNMP Version",
       "snmpNoDevice": "No SNMP devices. Click \"Add Device\" to start monitoring.",
       "snmpCollectMetrics": "Collected Metrics",
-      "snmpNoMetrics": "No metrics yet. Please collect first."
+      "snmpNoMetrics": "No metrics yet. Please collect first.",
+      "noTrendData": "No trend data",
+      "noTrendDataWaiting": "No trend data, waiting for collection",
+      "selectInstanceHint": "Select an instance to view trends and health",
+      "clickDeviceHint": "Click a device row to view CPU / Memory / Temperature / Fan trends",
+      "noMetricsHint": "No visualizable metrics, please complete at least one collection",
+      "usedHint": "Used {{value}}",
+      "clusterNodesHint": "Cluster {{value}} nodes",
+      "slowQueriesHint": "Slow queries {{value}}",
+      "pointCount": "{{min}} — {{max}} · {{count}} pts"
     },
     "logAlertBell": {
       "linked": "Alert Policy Linked",
@@ -4813,7 +4841,8 @@
       "neverReport": "Never report",
       "filterMode": "Filter Mode",
       "title": "Port Monitoring Policy",
-      "desc": "Configure Agent port reporting filter rules"
+      "desc": "Configure Agent port reporting filter rules",
+      "systemProcessDesc": "⚠️ Regardless of mode, the following system process ports {{neverReport}}: sshd, rpcbind, master, systemd, dbus-daemon, rsyslogd, etc. Automatically skipped during collection."
     },
     "postgresql": "PostgreSQL",
     "prevPage": "Previous",
@@ -5004,7 +5033,15 @@
       "probeDesc": "Configure probe tasks by protocol type, the system will automatically probe at intervals",
       "taskNotFound": "Probe task does not exist or has been deleted",
       "clickToObserve": "Click to view details",
-      "alerting": "Alerting"
+      "alerting": "Alerting",
+      "recommendFreq": "Recommended {{freq}}, min {{minFreq}}",
+      "seconds": "{{count}}s",
+      "minutes": "{{count}}min",
+      "hours": "{{count}}h",
+      "certDays": "{{count}}d",
+      "certRemaining": "Certificate remaining {{days}} days",
+      "checkFailed": "{{label}} failed",
+      "latencyFluctuation": "{{label}} latency fluctuation"
     },
     "siteProbe": "Site Probe",
     "siteProbeTitle": "Site Probe Tasks",
@@ -7933,7 +7970,8 @@
       "expertPrompt": "You are an AIOps capacity planning expert. Based on the following server resource capacity forecast data, provide a comprehensive risk assessment and actionable operations recommendations:",
       "resCpu": "Server CPU Compute",
       "resMemory": "Server Memory",
-      "resDisk": "Storage Disk Space"
+      "resDisk": "Storage Disk Space",
+      "summary": "- {{resource}}: Current {{current}}% → 7-day forecast {{predicted}}% (threshold {{threshold}}%), {{risk}}"
     },
     "capacityPlanPrompt": "Based on the following host resource usage, provide cost optimization and capacity planning advice (identify idle/overloaded hosts; suggest scale-down/scale-up)",
     "capacityPlanning": "Capacity Planning",