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/trace/TraceManager.tsx

@@ -26,6 +26,7 @@ import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { Badge } from '@/components/ui/badge';
 import { Card, CardContent, CardHeader, CardTitle} from '@/components/ui/card';
+import { StatStrip } from '@/components/ui/stat-strip';
 import {
   Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription
 } from '@/components/ui/dialog';
@@ -260,64 +261,14 @@ const TraceManager: React.FC = () => {
   return (
     <div className="space-y-6">
       {/* 统计卡片 */}
-      <div className="grid grid-cols-4 gap-4">
-        <Card>
-          <CardContent className="p-4">
-            <div className="flex items-center justify-between">
-              <div>
-                <p className="text-sm text-muted-foreground">总请求数</p>
-                <p className="text-2xl font-bold">{services.reduce((sum, s) => sum + s.requestCount, 0).toLocaleString()}</p>
-              </div>
-              <div className="p-3 bg-blue-100 rounded-lg">
-                <Activity className="w-5 h-5 text-blue-600" />
-              </div>
-            </div>
-          </CardContent>
-        </Card>
-        <Card>
-          <CardContent className="p-4">
-            <div className="flex items-center justify-between">
-              <div>
-                <p className="text-sm text-muted-foreground">平均错误率</p>
-                <p className="text-2xl font-bold">
-                  {(services.reduce((sum, s) => sum + s.errorRate, 0) / (services.length || 1)).toFixed(2)}%
-                </p>
-              </div>
-              <div className="p-3 bg-red-100 rounded-lg">
-                <AlertCircle className="w-5 h-5 text-red-600" />
-              </div>
-            </div>
-          </CardContent>
-        </Card>
-        <Card>
-          <CardContent className="p-4">
-            <div className="flex items-center justify-between">
-              <div>
-                <p className="text-sm text-muted-foreground">平均延迟</p>
-                <p className="text-2xl font-bold">
-                  {formatDuration(services.reduce((sum, s) => sum + s.avgDuration, 0) / (services.length || 1))}
-                </p>
-              </div>
-              <div className="p-3 bg-green-100 rounded-lg">
-                <Clock className="w-5 h-5 text-green-600" />
-              </div>
-            </div>
-          </CardContent>
-        </Card>
-        <Card>
-          <CardContent className="p-4">
-            <div className="flex items-center justify-between">
-              <div>
-                <p className="text-sm text-muted-foreground">服务数量</p>
-                <p className="text-2xl font-bold">{services.length}</p>
-              </div>
-              <div className="p-3 bg-purple-100 rounded-lg">
-                <Layers className="w-5 h-5 text-purple-600" />
-              </div>
-            </div>
-          </CardContent>
-        </Card>
-      </div>
+      <StatStrip
+        items={[
+          { label: '总请求', value: services.reduce((sum, s) => sum + s.requestCount, 0).toLocaleString(), color: 'blue' },
+          { label: '错误率', value: `${(services.reduce((sum, s) => sum + s.errorRate, 0) / (services.length || 1)).toFixed(2)}%`, color: 'red' },
+          { label: '平均延迟', value: formatDuration(services.reduce((sum, s) => sum + s.avgDuration, 0) / (services.length || 1)), color: 'amber' },
+          { label: '服务数', value: services.length, color: 'purple' },
+        ]}
+      />
 
       <Tabs value={activeTab} onValueChange={setActiveTab}>
         <TabsList className="grid w-full grid-cols-3 lg:w-[400px]">