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/system-BgtMMm0X.js

@@ -0,0 +1 @@
+import{h as e}from"./index-DfyorCky.js";const r={getLogs:async s=>e.get("/audit/logs",s),getLogDetail:async s=>e.get(`/audit/logs/${s}`),getModules:async()=>e.get("/audit/modules"),getActions:async()=>e.get("/audit/actions"),getStatistics:async()=>e.get("/audit/statistics"),exportLogs:async s=>e.download("/audit/logs/export","audit-logs.csv"),clearLogs:async()=>e.post("/audit/logs/clear")},n={list:async s=>e.get("/terminal-sessions",s),get:async s=>e.get(`/terminal-sessions/${s}`),getRecord:async s=>e.get(`/terminal-sessions/${s}/record`),kill:async s=>e.post(`/terminal-sessions/${s}/kill`),download:async s=>e.download(`/terminal-sessions/${s}/download`,`session-${s}.cast`),delete:async s=>e.delete(`/terminal-sessions/${s}`),batchDelete:async s=>e.post("/terminal-sessions/batch-delete",{ids:s})},o={list:async s=>e.get("/session-commands",s)},l={list:async s=>e.get("/login-logs",s)},p={getTemplates:async()=>e.get("/approvals/templates"),getTemplate:async s=>e.get(`/approvals/templates/${s}`),createTemplate:async s=>e.post("/approvals/templates",s),updateTemplate:async(s,t)=>e.put(`/approvals/templates/${s}`,t),deleteTemplate:async s=>e.delete(`/approvals/templates/${s}`),getProcesses:async s=>e.get("/approvals/processes",s),createProcess:async s=>e.post("/approvals/processes",s),approveProcess:async(s,t)=>e.post(`/approvals/processes/${s}/approve`,{comment:t}),rejectProcess:async(s,t)=>e.post(`/approvals/processes/${s}/reject`,{comment:t})};export{r as a,p as b,l,o as s,n as t};