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/core/__init__.py

@@ -0,0 +1,23 @@
+"""纯缠论结构：K 线单元、合并、笔、段、中枢、买卖点几何。"""
+
+from .ChanEnum import *  # noqa: F401,F403
+from .ChanKLU import ChanKLU
+from .ChanKLC import ChanKLC
+from .ChanBI import ChanBI
+from .ChanSBI import ChanSBI
+from .ChanSEG import ChanSEG
+from .ChanZS import ChanZS, ChanZS_Big
+from .ChanBIZS import ChanBIZS
+from .ChanBSP import ChanBSP
+
+__all__ = [
+    "ChanKLU",
+    "ChanKLC",
+    "ChanBI",
+    "ChanSBI",
+    "ChanSEG",
+    "ChanZS",
+    "ChanZS_Big",
+    "ChanBIZS",
+    "ChanBSP",
+]