feat(audit): F1+F2 告警静默规则标记完成 + 审计日志CSV导出实现

F1 告警静默规则 [done]:
- 后端 alert_silence.go: CRUD + Toggle (onetime/daily/weekly 三模式)
- 告警引擎 isSilenced 集成 (alert_engine.go)
- 前端 SilenceRuleTab + SilenceDialog
- 路由 /alerts/silences 已注册

F2 审计日志导出 [done]:
- 重写 ExportAuditLogs: 真正的 CSV 导出 (encoding/csv + UTF-8 BOM)
- 支持 module/action/username/startTime/endTime 筛选
- 导出限制 10000 条防溢出，自动记录审计日志
- JSON 格式向后兼容 (format=json)
- 前端 exportLogs 传递查询参数

同时包含累积的前期工作:
- 目录重构 internal/ -> controller/model/router (v0.55-v0.57)
- 后端分层架构 dto/repository/service/utils
- 审计模块全功能 (终端审计/操作审计/登录日志)
- asciicast v2 录制格式
- SFTP 文件浏览器
- StatStrip 紧凑统计条
- 在线会话自动刷新
- LiveMonitor WebSocket 诊断修复

验证: go build ✅ | npm run build ✅ | Docker 部署 ✅ | 10 回归端点 ✅ | CSV 导出 ✅ | 静默 CRUD ✅

frontend/src/components/monitor/dashboard/PrometheusDashboard.tsx

@@ -4,6 +4,7 @@ import { Server, Loader2, Activity, Cpu, RefreshCw, AlertTriangle, Container, Za
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { StatStrip } from '@/components/ui/stat-strip';
 import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
 import { http } from '@/services/http';
 
@@ -47,12 +48,14 @@ const Box = ( p: any) => <svg xmlns="http://www.w3.org/2000/svg" width="16" heig
 
 const K8sPanel: React.FC<{ d: Record<string, any>}> = ({ d }) => (
   <div className="space-y-4">
-    <div className="grid grid-cols-4 gap-3">
-      <Card className="bg-[var(--dg-bg-primary)] border-[var(--dg-border)]"><CardContent className="p-3 text-center"><div className="text-2xl font-bold text-purple-400">{d.podCount?.[0]?.value || 0}</div><div className="text-[10px] text-[var(--dg-text-muted)]">Pods</div></CardContent></Card>
-      <Card className="bg-[var(--dg-bg-primary)] border-[var(--dg-border)]"><CardContent className="p-3 text-center"><div className="text-2xl font-bold text-blue-400">{d.deployCount?.[0]?.value || 0}</div><div className="text-[10px] text-[var(--dg-text-muted)]">Deployments</div></CardContent></Card>
-      <Card className="bg-[var(--dg-bg-primary)] border-[var(--dg-border)]"><CardContent className="p-3 text-center"><div className="text-2xl font-bold text-emerald-400">{d.nodeCount?.[0]?.value || 0}</div><div className="text-[10px] text-[var(--dg-text-muted)]">Nodes</div></CardContent></Card>
-      <Card className="bg-[var(--dg-bg-primary)] border-[var(--dg-border)]"><CardContent className="p-3 text-center"><div className="text-2xl font-bold text-amber-400">{d.nsPods?.length || 0}</div><div className="text-[10px] text-[var(--dg-text-muted)]">Namespaces</div></CardContent></Card>
-    </div>
+    <StatStrip
+      items={[
+        { label: 'Pods', value: d.podCount?.[0]?.value || 0, color: 'purple' },
+        { label: 'Deployments', value: d.deployCount?.[0]?.value || 0, color: 'blue' },
+        { label: 'Nodes', value: d.nodeCount?.[0]?.value || 0, color: 'emerald' },
+        { label: 'Namespaces', value: d.nsPods?.length || 0, color: 'amber' },
+      ]}
+    />
     <div className="rounded-lg bg-[var(--dg-bg-primary)] border border-[var(--dg-border)] p-3 max-h-60 overflow-y-auto">
       <div className="text-xs font-medium mb-2 flex items-center gap-1"><Cpu className="w-3 h-3 text-purple-400" />节点 CPU / 内存利用率</div>
       {(d.nodeCPU || []).map(( n: any, i: number) => {
@@ -93,10 +96,12 @@ const NodePanel: React.FC<{ d: Record<string, any>}> = ({ d }) => (
 
 const PodPanel: React.FC<{ d: Record<string, any>}> = ({ d }) => (
   <div className="space-y-4">
-    <div className="grid grid-cols-4 gap-3">
-      <Card className="bg-[var(--dg-bg-primary)]"><CardContent className="p-3 text-center"><div className="text-xl font-bold text-emerald-400">{d.running?.[0]?.value||0}</div><div className="text-[10px] text-[var(--dg-text-muted)]">Running</div></CardContent></Card>
-      <Card className="bg-[var(--dg-bg-primary)]"><CardContent className="p-3 text-center"><div className="text-xl font-bold text-amber-400">{d.pending?.[0]?.value||0}</div><div className="text-[10px] text-[var(--dg-text-muted)]">Pending</div></CardContent></Card>
-    </div>
+    <StatStrip
+      items={[
+        { label: 'Running', value: d.running?.[0]?.value || 0, color: 'emerald' },
+        { label: 'Pending', value: d.pending?.[0]?.value || 0, color: 'amber' },
+      ]}
+    />
     <div className="rounded-lg bg-[var(--dg-bg-primary)] p-3 max-h-40 overflow-y-auto"><div className="text-xs font-medium mb-2">CPU Top 10</div>{(d.cpuTop||[]).map(( p: any,i:number)=><div key={i} className="flex items-center gap-2 text-[11px] mb-1"><span className="w-10 text-right text-[var(--dg-text-muted)]">{i+1}</span><span className="w-32 truncate" title={p.pod}>{p.pod}</span><MiniBar val={Number(p.value||0)*100} label={`${Number(p.value||0).toFixed(2)}c`} color="bg-purple-500" /></div>)}</div>
     <div className="rounded-lg bg-[var(--dg-bg-primary)] p-3 max-h-40 overflow-y-auto"><div className="text-xs font-medium mb-2">内存 Top 10</div>{(d.memTop||[]).map(( p: any,i:number)=><div key={i} className="flex items-center gap-2 text-[11px] mb-1"><span className="w-10 text-right text-[var(--dg-text-muted)]">{i+1}</span><span className="w-32 truncate" title={p.pod}>{p.pod}</span><span className="ml-auto">{fmtBytes(Number(p.value||0))}</span></div>)}</div>
   </div>