feat: Enhance trading system with new e_min_chg_pct parameter and related logic

Changes:
- Introduced the `e_min_chg_pct` parameter to define the minimum price change percentage compared to the previous day's close, enhancing the momentum trading strategy.
- Updated various functions and classes to incorporate this new parameter, ensuring it is utilized in both backtesting and live trading scenarios.
- Improved documentation and comments to clarify the purpose and usage of the new parameter across the codebase.

Impact:
- This addition allows for more precise control over trading conditions, potentially increasing the effectiveness of the momentum strategy while maintaining system integrity and performance.

kis_trader/execution/kis_client.py

@@ -951,10 +951,24 @@ class KISClient(SafeRequest):
             code=code, qty=qty, price=int(price), order_type="00", side="SELL"
         )
 
+    def uses_market_sell_ioc(self) -> bool:
+        """
+        실전 시장가 매도 IOC(ORD_DVSN=13) 사용 여부.
+        모의는 IOC/FOK 미지원 → 항상 False (주문은 01).
+        """
+        if self.mock:
+            return False
+        return bool(get_env_bool("USE_MARKET_IOC_SELL", True))
+
     def sell_market_order(self, code: str, qty: int) -> Optional[str]:
-        """시장가 매도.  IOC 에러가 너무 빈번한 경우를 위해 기본 '01' 일반 시장가."""
+        """
+        시장가 매도.
+        - 모의: 항상 01 (일반 시장가)
+        - 실전: USE_MARKET_IOC_SELL=true 이면 13(IOC), false 이면 01
+        """
+        order_type = "13" if self.uses_market_sell_ioc() else "01"
         return self._order(
-            code=code, qty=qty, price=0, order_type="01", side="SELL"
+            code=code, qty=qty, price=0, order_type=order_type, side="SELL"
         )
 
     # ------------------------------------------------------------------