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/api/log/log-center.ts

@@ -0,0 +1,66 @@
+// 日志中心 API — 无状态代理查询，平台不落库海量日志 // Logan.Li
+
+import { http, type ListResponse } from '@/utils/request';
+
+export interface LogDataSource {
+  id: number;
+  name: string;
+  type: 'loki' | 'elasticsearch';
+  url: string;
+  auth_type?: 'none' | 'basic' | 'bearer' | 'custom';
+  basic_auth?: boolean;
+  basic_auth_user?: string;
+  basic_auth_pass?: string;
+  token?: string;
+  headers?: string; // JSON 字符串，如 [{"name":"X-Scope-OrgID","value":"tenant-1"}]
+  skip_tls_verify?: boolean;
+  default_index?: string;
+  is_default?: boolean;
+  status?: number;
+}
+
+/** 查询结果行 — 仅用于当前页展示，不持久化 // Logan.Li */
+export interface LogQueryEntry {
+  timestamp: string;
+  level?: string;
+  message: string;
+  labels?: Record<string, string>;
+  raw?: string;
+}
+
+/** 数据源连接测试结果 // Logan.Li */
+export interface TestConnectionResult {
+  status: 'ok' | 'failed';
+  error?: string;
+}
+
+export const logCenterApi = {
+  listDatasources: (type?: string) =>
+    http.get<ListResponse<LogDataSource>>('/log-datasources', type ? { type } : undefined),
+  createDatasource: (data: Record<string, unknown>) => http.post('/log-datasources', data),
+  updateDatasource: (id: number | string, data: Record<string, unknown>) =>
+    http.put(`/log-datasources/${id}`, data),
+  deleteDatasource: (id: number | string) => http.delete(`/log-datasources/${id}`),
+  setDefaultDatasource: (id: number | string) => http.post(`/log-datasources/${id}/default`),
+  testDatasource: (data: Record<string, unknown>) => http.post<TestConnectionResult>('/log-datasources/test', data),
+  /** 通过代理查询 ES 集群索引列表 // Logan.Li */
+  listIndices: (params: Record<string, string>) =>
+    http.get<string[]>('/log-datasources/indices', params),
+  queryLoki: (data: {
+    datasource_id: number;
+    query: string;
+    limit?: number;
+    start?: string;
+    end?: string;
+    direction?: string;
+  }) => http.post<{ entries: LogQueryEntry[]; total: number }>('/logs/loki/query', data),
+  queryElasticsearch: (data: {
+    datasource_id: number;
+    index?: string;
+    query?: string;
+    query_body?: Record<string, unknown>;
+    size?: number;
+    start?: string;
+    end?: string;
+  }) => http.post<{ entries: LogQueryEntry[]; total: number }>('/logs/elasticsearch/query', data),
+};