feat(web): 前端全局重构专业量化后台(深色+红涨绿跌+设计系统)

- 设计系统 styles/tokens.css: 深色token(#0d1117底/#161b22卡片) + 红涨绿跌
  (--up#f85149/--down#3fb950) + 品牌蓝#1890ff + 间距/圆角/阴影/mono
- Element Plus深色(element-dark.css + dark/css-vars)+reset
- 删Vite脚手架残留(style.css重写/HelloWorld/hero/vite/vue资源)
- Layout重构(深色专业侧边)+Login+图表统一深色(useChart/echartsDark)
- 新建paper/Live.vue实走监控(step状态/净值/持仓/今日信号10s轮询)
- 业务页套.page头, 保留所有功能/路由/api
- 验证: vue-tsc --noEmit ✅ + npm run build ✅

frontend/src/router/index.ts

@@ -18,6 +18,7 @@ const routes: RouteRecordRaw[] = [
       { path: 'factor/result/:id', name: 'fc-result', component: () => import('@/views/factor/Result.vue') },
       { path: 'paper/new', name: 'paper-new', component: () => import('@/views/paper/New.vue') },
       { path: 'paper/result/:id', name: 'paper-result', component: () => import('@/views/paper/Result.vue') },
+      { path: 'paper/live/:aid', name: 'paper-live', component: () => import('@/views/paper/Live.vue') },
     ],
   },
 ]