debt(D6): Admin 导航单源 —— NAV_ITEMS 派生侧栏/命令面板/面包屑

- 新增 admin/nav.ts: 唯一配置源 NAV_ITEMS(to/label/group/icon/hideFromSidebar)
- COMMAND_PALETTE_PAGES / ROUTE_LABELS / NAV_SECTIONS 全部由其派生
- 删除 AdminLayout 中三份平行清单(已出现漂移: data-pipeline 不在侧栏、
  「系统」vs「系统设置」命名不一致、monitoring/eval 顺序两处相反)
- 已知微差: 命令面板「评估与监控」组内顺序统一为侧栏口径(eval 在前)
- 行为不变: 路由/标签/分组标题均保持现状;data-pipeline 保持仅面板可达

frontend/src/admin/AdminLayout.tsx

@@ -9,6 +9,7 @@ import { useState, useEffect, useCallback } from 'react'
 import { NavLink, Outlet, useLocation } from 'react-router-dom'
 import { fetchAuthState, logout, UNAUTHORIZED_EVENT } from './api'
 import { fetchHealth } from './dal'
+import { COMMAND_PALETTE_PAGES, ROUTE_LABELS, NAV_SECTIONS } from './nav'
 import Login from './Login'
 import { useCommandPalette, CommandPalette } from './useCommandPalette'
 
@@ -88,58 +89,9 @@ function Icon({ name }: { name: string }) {
   }
 }
 
-const NAV_PAGES: Array<{ to: string; label: string; group: string }> = [
-  { to: '/admin', label: '仪表盘', group: '概览' },
-  { to: '/admin/collection', label: '数据采集', group: '数据流水线' },
-      { to: '/admin/data-completeness', label: '数据完整性', group: '数据流水线' },
-      { to: '/admin/data-pipeline', label: '数据管线', group: '数据流水线' },
-      { to: '/admin/predictions', label: '预测历史', group: '数据流水线' },
-  { to: '/admin/backtest', label: '回测', group: '数据流水线' },
-  { to: '/admin/monitoring', label: '监控', group: '评估与监控' },
-  { to: '/admin/eval', label: '评估', group: '评估与监控' },
-  { to: '/admin/settings', label: '设置', group: '系统' },
-  { to: '/admin/logs', label: '日志', group: '系统' },
-]
-
-// 路由 → 面包屑标签
-const ROUTE_LABELS: Record<string, string> = {
-  '/admin': '仪表盘',
-  '/admin/collection': '数据采集',
-  '/admin/data-completeness': '数据完整性',
-  '/admin/data-pipeline': '数据管线',
-  '/admin/predictions': '预测历史',
-  '/admin/backtest': '回测',
-  '/admin/monitoring': '监控',
-  '/admin/settings': '设置',
-  '/admin/logs': '日志',
-  '/admin/eval': '评估',
-}
-
-const NAV_SECTIONS: { title: string; items: Array<{ to: string; label: string; icon: string }> }[] = [
-  {
-    title: '数据流水线',
-    items: [
-      { to: '/admin/collection', label: '数据采集', icon: 'collection' },
-      { to: '/admin/data-completeness', label: '数据完整性', icon: 'chart' },
-      { to: '/admin/predictions', label: '预测历史', icon: 'logs' },
-      { to: '/admin/backtest', label: '回测', icon: 'repeat' },
-    ],
-  },
-  {
-    title: '评估与监控',
-    items: [
-      { to: '/admin/eval', label: '评估', icon: 'eval' },
-      { to: '/admin/monitoring', label: '监控', icon: 'monitor' },
-    ],
-  },
-  {
-    title: '系统设置',
-    items: [
-      { to: '/admin/settings', label: '设置', icon: 'settings' },
-      { to: '/admin/logs', label: '日志', icon: 'logs' },
-    ],
-  },
-]
+// D6: 导航三视图(侧栏/命令面板/面包屑)统一由 admin/nav.ts 的 NAV_ITEMS
+// 单源派生 —— 此处的 NAV_PAGES/ROUTE_LABELS/NAV_SECTIONS 平行清单已删除,
+// 新增页面/改标签只改 nav.ts 一处。
 
 /** 报眉日期行,与前台同款式 */
 function dateLine(): string {
@@ -156,7 +108,7 @@ export default function AdminLayout() {
   const [healthOk, setHealthOk] = useState<boolean | null>(null)
   const [authed, setAuthed] = useState<boolean | null>(null)
   const location = useLocation()
-  const palette = useCommandPalette(NAV_PAGES)
+  const palette = useCommandPalette(COMMAND_PALETTE_PAGES)
 
   // 登录门禁:挂载时探测会话,收到 401 事件(会话过期)自动切回登录页
   useEffect(() => {