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_FX_Box.py

@@ -1,7 +1,5 @@
-class Chan_FX_Box():
-	def __init__(self, start_time, end_time, high, low):
-		self.start_time = start_time
-		self.end_time = end_time
-		self.high = high
-		self.low = low
-	
+"""兼容 shim：请优先 from chan... 导入。本文件仅保持旧路径可用。"""
+import importlib
+import sys
+_impl = importlib.import_module("chan.core.Chan_FX_Box")
+sys.modules[__name__] = _impl