feat: 第四类买卖点（B4/S4）融入缠论引擎与 web 展示

研究侧的 fast_bsp3 一直只活在 research/lib/ 里，web 端看不到，回测与目视
两条线对不上。这次把它搬进引擎，作为独立的第四类买卖点。

之所以单独立类而不是当作 B3/S3 的低滞后版：step30/31 显示引擎原生的
B3/S3 统计上呈逆势、显著亏损（胜率 27.4%、PF 0.66、t −18.76），而同一组
过滤器把 B4 从 PF 1.59 提到 2.26 却对它无效（0.66→0.71）。两者选的是
不同的交易群体，不是同一信号的早晚两版。

- chanlun/analysis/fast_bsp.py 原样搬入 find_fast_bsp3 与 build_htf_zones，
  另加 add_zone_ladder / htf_fx_timeline / attach_htf_agree
- research/lib/ 两个模块改为转发，所有 step 脚本导入不变，信号逐条比对一致
- 大级别上下文用 resample 从同一份 df 构建，不额外拉数据，因此与界面上选的
  周期和时间范围无关
- 前端三个复选框 + 过滤模式下拉；未过滤的原始信号用浅色，避免与主口径混淆

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

chanlun/pipeline/timeframe.py

@@ -30,13 +30,14 @@ from chanlun.core.ChanZS import ChanZS, ChanZS_Big
 from chanlun.indicators.ChanMACD import ChanMACD
 from chanlun.pipeline.builders.bi import BiBuilderMixin
 from chanlun.pipeline.builders.bsp import BspBuilderMixin
+from chanlun.pipeline.builders.fast_bsp import FastBspBuilderMixin
 from chanlun.pipeline.builders.incremental import IncrementalBuilderMixin
 from chanlun.pipeline.builders.indicators import IndicatorsBuilderMixin
 from chanlun.pipeline.builders.kline import KlineBuilderMixin
 from chanlun.pipeline.builders.seg import SegBuilderMixin
 from chanlun.pipeline.builders.zs import ZsBuilderMixin
 
-class TF_DF(IndicatorsBuilderMixin, KlineBuilderMixin, BiBuilderMixin, SegBuilderMixin, ZsBuilderMixin, BspBuilderMixin, IncrementalBuilderMixin):
+class TF_DF(IndicatorsBuilderMixin, KlineBuilderMixin, BiBuilderMixin, SegBuilderMixin, ZsBuilderMixin, BspBuilderMixin, FastBspBuilderMixin, IncrementalBuilderMixin):
 	def __init__(self, df=None, interval=0, timeframe=None):
 		if df is not None:
 			self.init_TF_DF(df, interval, timeframe)
@@ -61,6 +62,7 @@ class TF_DF(IndicatorsBuilderMixin, KlineBuilderMixin, BiBuilderMixin, SegBuilde
 		self.zs_list = []
 		self.bi_zs_list = []
 		self.bsp_list = []
+		self.fast_bsp_list = []
 		self.seg_list = []
 		self.klc_fx_list = []
 		self.klu_list = self.cal_kl_data(self.dataframe)