feat: add Algo Order API support and update ML feature handling

- Introduced support for Algo Order API, allowing automatic sending of STOP_MARKET and TAKE_PROFIT_MARKET orders.
- Updated README.md to include new features related to Algo Order API and real-time handling of ML features.
- Enhanced ML feature processing to fill missing OI and funding rate values with zeros for consistency in training data.
- Added new training log entries for the lgbm model with updated metrics.

src/ml_features.py

@@ -127,4 +127,8 @@ def build_features(
             "xrp_eth_rs": float(_calc_rs(ret_1, eth_ret_1)),
         })
 
+    # 실시간에서는 OI/펀딩비를 수집하지 않으므로 0으로 채워 학습 피처(23개)와 일치시킨다
+    base.setdefault("oi_change", 0.0)
+    base.setdefault("funding_rate", 0.0)
+
     return pd.Series(base)