币本位期权数据统计按指数折算为U，不再误标USDC导致0.00

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

tests/test_options_stats_lib.py

@@ -84,3 +84,21 @@ class OptionsStatsLibTests(TestCase):
         self.assertAlmostEqual(out["profit_loss_ratio"], 0.33, places=2)
         self.assertEqual(out["open_count"], 1)
         self.assertAlmostEqual(out["net_realized_pnl"], round(0.87 - 3.99 - 1.33, 4), places=4)
+
+    def test_compute_options_stats_coin_to_usdt(self):
+        history = [
+            {
+                "status": "closed",
+                "realized_pnl": 0.00078,
+                "premium_ccy": "ETH",
+                "margin_mode": "coin",
+                "inst_id": "ETH-USD-260822-2250-C",
+                "idx_px": 2280,
+                "created_at": "2026-08-20 08:00:00",
+                "closed_at": "2026-08-20 13:32:00",
+            }
+        ]
+        out = compute_options_stats_from_history(history)
+        self.assertEqual(out["pnl_unit"], "U")
+        self.assertEqual(out["total_closed"], 1)
+        self.assertAlmostEqual(out["net_realized_pnl"], 0.00078 * 2280, places=4)