Restyle the web UI as a dark trading terminal

- Single palette (web/src/styles/palette.ts) taken from the Stitch
  design, exposed as ap-* UnoCSS colors and --ap-* CSS variables and
  used for Element Plus dark theme overrides, KLineChart and the news
  iframe; zero radius, JetBrains Mono / Space Grotesk bundled locally
- New sidebar and header layout; trading page, plan card and analysis
  drawer follow the design; other pages use the same panels
- Status API reports today's closed trades, wins and net PnL, shown as
  today's PnL and win rate on the trading page

web/src/router/index.ts

@@ -1,15 +1,16 @@
+import { ChatDotRound, Collection, DataAnalysis, Document, Monitor, Setting, TrendCharts } from "@element-plus/icons-vue"
 import { createRouter, createWebHistory } from "vue-router"
 import Layout from "@/layouts/index.vue"
 import { useUserStore } from "@/pinia/user"
 
 export const menuRoutes = [
-  { path: "/news", name: "news", component: () => import("@/pages/news/index.vue"), meta: { title: "新闻流" } },
-  { path: "/crawler", name: "crawler", component: () => import("@/pages/crawler/index.vue"), meta: { title: "采集控制台" } },
-  { path: "/market", name: "market", component: () => import("@/pages/market/index.vue"), meta: { title: "行情" } },
-  { path: "/trading", name: "trading", component: () => import("@/pages/trading/index.vue"), meta: { title: "模拟盘" } },
-  { path: "/chat", name: "chat", component: () => import("@/pages/chat/index.vue"), meta: { title: "Chat" } },
-  { path: "/skills", name: "skills", component: () => import("@/pages/skills/index.vue"), meta: { title: "Skills" } },
-  { path: "/settings", name: "settings", component: () => import("@/pages/settings/index.vue"), meta: { title: "环境变量" } }
+  { path: "/news", name: "news", component: () => import("@/pages/news/index.vue"), meta: { title: "新闻流", icon: Document } },
+  { path: "/crawler", name: "crawler", component: () => import("@/pages/crawler/index.vue"), meta: { title: "采集控制台", icon: Monitor } },
+  { path: "/market", name: "market", component: () => import("@/pages/market/index.vue"), meta: { title: "行情", icon: TrendCharts } },
+  { path: "/trading", name: "trading", component: () => import("@/pages/trading/index.vue"), meta: { title: "模拟盘", icon: DataAnalysis } },
+  { path: "/chat", name: "chat", component: () => import("@/pages/chat/index.vue"), meta: { title: "Chat", icon: ChatDotRound } },
+  { path: "/skills", name: "skills", component: () => import("@/pages/skills/index.vue"), meta: { title: "Skills", icon: Collection } },
+  { path: "/settings", name: "settings", component: () => import("@/pages/settings/index.vue"), meta: { title: "环境变量", icon: Setting } }
 ]
 
 export const router = createRouter({