Changes

Summary

1. fix: 调整自动构建结束直线姿态和终点扩展长度的计算逻辑 (details)
2. fix: road segment splitting bug. (details)
3. refact: GetRoadSegmentFirstSplitPos (details)

Commit 9e80ba1dd25ec991530e8a553d3091634c647c0f by wuyanjun110 fix: 调整自动构建结束直线姿态和终点扩展长度的计算逻辑
	data/ssep/into_yard_junction_ec.cpp
Commit 6602d54db962af381c83bd63f4d23cecef6f9642 by chenran fix: road segment splitting bug.
	data/map/pnc_map/pnc_map.cpp
Commit 5ea473b606083edbe4736f0a0cb6fbf6bb141762 by chenran refact: GetRoadSegmentFirstSplitPos
	data/map/pnc_map/pnc_map.cpp