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_mobile_nav.js

@@ -2,7 +2,7 @@
  * 实例手机壳: ≤720px 底栏 +「更多」,与 embed soft-nav 同步.
  */
 (function (global) {
-  const PRIMARY = { trade: 1, key_monitor: 1, options: 1 };
+  const PRIMARY = { hedge_plan: 1, options: 1 };
   const MQ = "(max-width: 720px)";
 
   function isEmbedShell() {
@@ -26,7 +26,7 @@
       const t = new URLSearchParams(location.search).get("tab");
       if (t) return t;
     } catch (_) {}
-    return (document.body && document.body.getAttribute("data-page")) || "trade";
+    return (document.body && document.body.getAttribute("data-page")) || "hedge_plan";
   }
 
   function closeMore() {
@@ -106,7 +106,7 @@
       env_config: "/env_config",
       settings: "/settings",
     };
-    location.href = pathMap[tab] || "/trade";
+    location.href = pathMap[tab] || "/hedge-plan";
   }
 
   function bindChrome() {