fix期权复盘与数据统计双口径盈亏，并修复卖回封顶导致盈利单冻成亏损。

平仓卖光可卖币后再按账户差分结算复盘；数据统计改为历史币盈亏×卖回价；复盘展示初始权利金与盈利率，并附历史修复脚本。

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

tests/test_spot_dust_and_sell_cap.py

@@ -28,12 +28,22 @@ class TestSpotDust(unittest.TestCase):
 
 class TestSellCapLogic(unittest.TestCase):
     def test_excess_cap_math(self):
+        """开仓清过量仍按 coin_bought 封顶;平仓卖回不再用权利金封顶."""
         bought, keep = 0.01, 0.004
         excess = max(0.0, bought - keep)
         self.assertAlmostEqual(excess, 0.006)
         sell_amt = min(0.02, excess)
         self.assertAlmostEqual(sell_amt, 0.006)
 
+    def test_flat_sell_does_not_use_premium_cap(self):
+        import inspect
+
+        from lib.options import options_spot_bridge_lib as m
+
+        src = inspect.getsource(m.sell_residual_after_option_flat)
+        self.assertIn("coin_amount=None", src)
+        self.assertNotIn("sell_cap if", src)
+
 
 class TestMaybeSellAfterCloseGuard(unittest.TestCase):
     """平仓后卖回:持仓查询失败/空响应绝不卖币."""