新增 local→serve 数据同步功能

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

local/frontend/src/components/Layout.tsx

@@ -44,6 +44,7 @@ import {
   BookOpenCheck,
   ExternalLink,
   X,
+  Upload,
 } from 'lucide-react'
 import { Logo } from './Logo'
 import { api, type IndexQuote } from '@/lib/api'
@@ -78,6 +79,7 @@ const nav = [
   { to: '/indices', label: '指数', icon: BarChart3 },
   { to: '/trading', label: '交易', icon: Cable },
   { to: '/data',       label: '数据',   icon: Database },
+  { to: '/sync',      label: '数据同步', icon: Upload },
 ] as const
 
 function fmtIndexValue(v: number | null | undefined) {