feat: 市场看板 - 聚合同花顺SDK全量数据的A股实时看板

- 新增 /dashboard 页面：暗色主题，指数行情/市场温度/涨跌分布/行业强度/概念热度/事件情报
- 后端聚合接口 /api/market-dashboard，30秒缓存
- 利用SDK接口：指数行情、全市场快照、涨停/跌停/炸板池、连板天梯、热门股、飙升榜、龙虎榜、异动分析、集合竞价基准、行业/概念目录
- 市场温度评分：6因子加权（涨跌比/中位涨跌/强弱比/涨停活跃度/炸板惩罚/竞价信号）
- 首页添加市场看板导航入口

src/routes/index.tsx

@@ -10,7 +10,7 @@ import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogTrigger } from
 import { AlertDialog, AlertDialogAction, AlertDialogCancel, AlertDialogContent, AlertDialogDescription, AlertDialogFooter, AlertDialogHeader, AlertDialogTitle } from "@/components/ui/alert-dialog";
 import { Label } from "@/components/ui/label";
 import { Textarea } from "@/components/ui/textarea";
-import { Search, Plus, Share2, Trash2, TrendingUp, Loader2, Flame, Network } from "lucide-react";
+import { Search, Plus, Share2, Trash2, TrendingUp, Loader2, Flame, Network, BarChart3 } from "lucide-react";
 import { toast } from "sonner";
 
 export const Route = createFileRoute("/")({
@@ -212,6 +212,12 @@ function Index() {
           </h1>
           <p className="text-sm md:text-base text-muted-foreground">创建股票集合，分享历史走势</p>
           <div className="mt-3 flex items-center justify-center gap-2">
+            <Link to="/dashboard">
+              <Button variant="outline" size="sm" className="gap-1.5 text-xs">
+                <BarChart3 className="h-3.5 w-3.5" />
+                市场看板
+              </Button>
+            </Link>
             <Link to="/themes">
               <Button variant="outline" size="sm" className="gap-1.5 text-xs">
                 <Flame className="h-3.5 w-3.5" />