refactor: 缠论引擎迁入 chan/ 分层解耦，指标外置

将核心结构、指标与分析拆到 chan/{core,indicators,analysis,pipeline}；
根目录保留兼容 shim；strategies 改为从 chan 包导入；买卖点经 bsp_macd 与 MACD 接合。

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

chan/indicators/store.py

@@ -0,0 +1,41 @@
+"""按 bar idx 查询指标值。"""
+
+from __future__ import annotations
+
+from typing import Any, Dict, Optional
+
+import pandas as pd
+
+
+class IndicatorStore:
+    """以 DataFrame 列 + 行 idx 对齐的只读指标视图。"""
+
+    def __init__(self, df: pd.DataFrame):
+        self._df = df
+
+    @property
+    def dataframe(self) -> pd.DataFrame:
+        return self._df
+
+    def __len__(self) -> int:
+        return len(self._df)
+
+    def get(self, idx: int, name: str, default: Any = None) -> Any:
+        if idx < 0 or idx >= len(self._df):
+            return default
+        if name not in self._df.columns:
+            return default
+        val = self._df.iloc[idx][name]
+        if pd.isna(val):
+            return default
+        return val
+
+    def row(self, idx: int) -> Optional[Dict[str, Any]]:
+        if idx < 0 or idx >= len(self._df):
+            return None
+        return self._df.iloc[idx].to_dict()
+
+    def series(self, name: str):
+        if name not in self._df.columns:
+            return None
+        return self._df[name]