重构首页为机构落地页，新增终端路由，时区感知 Polymarket 市场发现

frontend/app/page.tsx

@@ -1,11 +1,11 @@
 import type { Metadata } from "next";
 import { redirect } from "next/navigation";
-import { DashboardEntry } from "@/components/dashboard/DashboardEntry";
+import { InstitutionalLandingPage } from "@/components/landing/InstitutionalLandingPage";
 
 export const metadata: Metadata = {
-  title: "PolyWeather - Global Weather Intelligence Map",
+  title: "PolyWeather | Institutional Weather Market Intelligence",
   description:
-    "PolyWeather dashboard with METAR, MGM, DEB fusion forecast, multi-model comparison, and AI weather decision cards.",
+    "PolyWeather is a paid professional weather-market intelligence terminal with METAR evidence, DEB forecast blending, and AI decision cards.",
 };
 
 export default async function HomePage({
@@ -29,5 +29,5 @@ export default async function HomePage({
     const qs = usp.toString();
     redirect(`/auth/callback${qs ? `?${qs}` : ""}`);
   }
-  return <DashboardEntry />;
+  return <InstitutionalLandingPage />;
 }