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 ✅

backend/static/assets/automation-mtL167W_.js

@@ -0,0 +1 @@
+import{h as e}from"./index-DfyorCky.js";const c={getJobs:async t=>e.get("/cron-jobs",t),getJob:async t=>e.get(`/cron-jobs/${t}`),createJob:async t=>e.post("/cron-jobs",t),updateJob:async(t,r)=>e.put(`/cron-jobs/${t}`,r),deleteJob:async t=>e.delete(`/cron-jobs/${t}`),toggleJob:async t=>e.post(`/cron-jobs/${t}/toggle`),executeJob:async t=>e.post(`/cron-jobs/${t}/execute`),batchDelete:async t=>e.delete("/cron-jobs/batch-delete",{ids:t})},n={getScripts:async t=>e.get("/scripts",t),getScript:async t=>e.get(`/scripts/${t}`),createScript:async t=>e.post("/scripts",t),updateScript:async(t,r)=>e.put(`/scripts/${t}`,r),deleteScript:async t=>e.delete(`/scripts/${t}`),batchDelete:async t=>e.post("/scripts/batch-delete",{ids:t}),executeScript:async t=>e.post(`/scripts/${t}/execute`)},o={getExecutions:async t=>e.get("/task-executions",t)};export{c,n as s,o as t};