fix: 回测结果买入/卖出次数统计使用 long/short 方向#32
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Pull request overview
该 PR 修复学习示例脚本在展示回测结果时，对交易“买入/卖出次数”的统计口径与回测引擎实际记录的交易方向字段不一致的问题（引擎使用 long/short）。
Changes:
- 将交易方向统计从
buy/sell调整为long/short以匹配回测引擎输出 - 在示例回测参数中修改了
end_date（回测区间缩短）
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学习实例/04_策略回测.py:199
- 本 PR 标题/描述聚焦“回测结果买入/卖出次数统计方向修复”，但这里把回测区间的 end_date 从 20241231 改为 20240228，会显著改变示例回测结果与可复现性。若只是为了缩短演示运行时间，建议在 PR 描述中说明原因，或改为通过参数/提示让用户自行选择；否则应保持原回测区间不变。
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回测引擎记录的交易方向为 'long'/'short'，但展示代码按 'buy'/'sell' 过滤，导致买入/卖出次数始终为 0。
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修复