Make hedge the default home and drop unused product-surface entries.

Put永期/期期对冲 first in nav, default embed tab to hedge_plan, and remove risk-policy/options-account UI instead of only hiding them.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/common/static/instance_embed.js

@@ -44,7 +44,7 @@
       const t = new URLSearchParams(location.search).get("tab");
       if (t) return t;
     } catch (_) {}
-    return document.body.getAttribute("data-page") || "trade";
+    return document.body.getAttribute("data-page") || "hedge_plan";
   }
 
   function listWindowQueryString() {
@@ -401,7 +401,7 @@
     const options = opts || {};
     if (!tab) return;
     if (!pageNavAllowed(tab)) {
-      void loadTab("trade", { replace: true });
+      void loadTab("hedge_plan", { replace: true });
       return;
     }
 
@@ -564,7 +564,7 @@
     initBootPane();
     const bootTab = getTab();
     if (!pageNavAllowed(bootTab)) {
-      void loadTab("trade", { replace: true });
+      void loadTab("hedge_plan", { replace: true });
       return;
     }
     if (bootTab === "settings") {