系统设置 env 配置增加中控 Bridge Token，便于复制到中控登记。

Token 改为明文可编辑并热更新，同步放开 HUB_EMBED_FRAME_ANCESTORS。

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

tests/test_remove_hedge_smoke.py

@@ -83,6 +83,8 @@ class RemoveHedgeSmokeTests(unittest.TestCase):
         self.assertNotIn("OKX_OPTIONS_COMPOUND_FULL_ENABLED", keys)
         self.assertNotIn("OKX_OPTIONS_CLOSE_RECYCLE_MULT", keys)
         self.assertIn("OKX_OPTIONS_COIN_COMPOUND", keys)
+        self.assertIn("HUB_BRIDGE_TOKEN", keys)
+        self.assertIn("中控对接", titles)
         mode_opts = [o["value"] for o in select_options_for("OKX_TRADE_MODE")]
         self.assertEqual(mode_opts, ["options"])