refactor(frontend): api/components/pages 目录架构统一对齐菜单域 + 日志中心修复

1. 目录架构统一（API = components = 菜单域，一域一目录 + barrel）
   - log/ 提为独立顶层域（日志中心在菜单中与监控中心平级，不再塞在 monitor/）
   - task/ 拆分原 automation.ts → cron-job / script / remote-exec
   - aiops/ 合并 ai.ts + agentCli.ts → assistant + agent-cli
   - agent/ approval/ audit/ 提升为域目录
   - auth 拆分：authApi(认证自服务) + system/user.ts(userApi+ldapApi 管理端)
   - components/automation → components/task，菜单"自动化运维"→"作业任务"
   - pages/ 按域分子目录(approval/audit/monitor)，删孤儿 AuditPage.tsx
   - 所有 API 符号名不变，组件经 @/api 聚合引用，运行时行为零变化

2. Loki 查询无返回修复：aiops 容器 DNS 解析外网域名失败
   （宿主机 systemd-resolved 转发链路异常），docker-compose 显式配 dns 上游

3. ES 查询框布局：工具栏单行挤 7 控件(ES 多 150px 索引框)，拆两行——
   查询输入独占一行(+查询按钮)，次级控件换行 flex-wrap

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/components/auth/Login.tsx

@@ -3,7 +3,7 @@ import { useNavigate } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import { User, Lock, Palette, Check, Loader2, AlertCircle, Eye, EyeOff, Languages } from 'lucide-react';
 import { useUserStore, useLanguageStore } from '@/store';
-import { userApi } from '@/api';
+import { authApi } from '@/api';
 import { useTheme, THEME_OPTIONS } from '@/hooks/useTheme';
 import { cn } from '@/lib/utils';
 import { SUPPORTED_LANGUAGES, type AppLanguage } from '@/i18n';
@@ -89,7 +89,7 @@ export function Login() {
     setError('');
     setLoading(true);
     try {
-      const result = await userApi.login(username, password) as { user: any; token: string; permissions?: string[] };
+      const result = await authApi.login(username, password) as { user: any; token: string; permissions?: string[] };
       useUserStore.getState().login(result.user, result.token, result.permissions ?? null);
       localStorage.setItem('token', result.token);
       navigate('/', { replace: true });