feat(接口2): 移植head3d发际线管线 + 接口2实现方案文档

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- 从head3d复制发际线检测管线到 hairline/ 包：MediaPipe Tasks + SegFormer分割
  + 17锚点射线检测 + 502点mesh(face_ext.obj)+UV
- 复制模型：face_landmarker.task(3.7MB)、SegFormer config/preprocessor
  (model.safetensors 340MB 单独下载中)
- 新增 docs/接口2-C端生发-技术实现方案.md：第一步=发际线曲线叠加预览图，
  新增gender必填参数，按性别贴图数量输出(female5/male4)，hairline_type英文key，
  服务端cv2逐三角形warp渲染器(head3d只有浏览器端Three.js渲染)
- 接口文档.md 接口2章节同步：gender参数、输出语义、错误码说明
- hairline_texture/ 9张发际线贴图入库

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xsl

2026-06-14 16:59:39 +08:00

parent 5e513c7006

commit db32fa12e5

19 changed files with 6913 additions and 10 deletions

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hairline/mesh/face.obj

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hairline/mesh/face_ext.obj

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