feat: 一票制并发锁 + MT5硬止损兜底

- 一票制: _pending_long/_pending_short 计数器防同一周期内多信号穿透
- 硬止损: MT5下单时附带sl/tp，倍率1.5x(止损)/1.3x(止盈)，比EA软止损更宽
- config.py: 新增 hard_sl_multiplier/hard_tp_multiplier
- 全部 send_order 链路(abc/remote/live/server/dryrun/backtest) 支持 sl/tp 参数
- 对冲模块: 彻底移除
- 日志: 去重+30轮摘要

core/data/remote.py

@@ -92,11 +92,16 @@ class RemoteDataProvider(DataProvider):
         except Exception:
             return None
 
-    def send_order(self, symbol, order_type, volume):
+    def send_order(self, symbol, order_type, volume, sl=None, tp=None):
         try:
+            body = {"symbol": symbol, "order_type": order_type, "volume": volume}
+            if sl is not None:
+                body["sl"] = sl
+            if tp is not None:
+                body["tp"] = tp
             resp = self._session.post(
                 f"{self.base_url}/order",
-                json={"symbol": symbol, "order_type": order_type, "volume": volume},
+                json=body,
                 timeout=10,
             )
             if resp.status_code != 200: