修正期期盈亏比口径：按总权利金计算，残值按本合约

盈利腿触发改为盈利金额/总权利金；亏损腿残值20%仍相对该合约自身权利金。

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

tests/test_hedge_plan_calc.py

@@ -110,7 +110,7 @@ class TestHedgePlanCalc(unittest.TestCase):
         self.assertEqual(p["summary"]["premium_paid"], 10)
         self.assertTrue(p["summary"]["expiry_is_loss"])
         self.assertEqual(p["summary"]["profit_rr"], 2)
-        self.assertEqual(p["summary"]["at_rr_a_full_total"], 5)  # 2*5 - 5
+        self.assertEqual(p["summary"]["at_rr_a_full_total"], 15)  # 盈利=2*10, 亏腿-5
         self.assertEqual(len(p["scenarios"]), 5)
         self.assertEqual(p["scenarios"][0]["id"], "rr_leg_a_full")
         self.assertEqual(p["scenarios"][1]["id"], "rr_leg_b_full")