docs: freeze YuXinGu lexicon, journey, and P1 engineering sources

Establish product language contract, user journey with dual growth engines,
ERD/OpenAPI/Go boundaries, and H5 routes (/profile, /portrait, /relation,
/membership) before P1 implementation.

Co-authored-by: Cursor <cursoragent@cursor.com>
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# Engineering Freeze — 进入 P1 开发前真源
以下文件为 **P1 冻结输入**;改动需 ADR 或产品确认。
| # | 真源 | 路径 |
|---|---|---|
| 1 | 产品语言 | `product/lexicon.md` |
| 2 | 能力树 + 冻结 IA | `product/feature-map.md` |
| 3 | 用户旅程 | `product/user-journey.md` |
| 4 | H5 页面树 | `product/page-tree.md` |
| 5 | 域词 | `domain.md` |
| 6 | Domain Map | `domain/domain-map.md` |
| 7 | ERD | `domain/erd.md` |
| 8 | API Contract | `proto/openapi.yaml` |
| 9 | Go 服务边界 | `architecture/go-services.md` |
| 10 | Design System | `design/design-system.md` |
下一步:**按 P1 竖切实现**Profile → Portrait → RelationInsight → Scale → Commerce mock → Ask 壳),不再横向加功能。
## Review 清单(合并前必过)
1. 用户可见文本是否仅来自 lexicon?有无旧产品词/玄学预测?
2. 路由是否落在 page-tree
3. Domain / 表名是否符合 domain.md(无 decode/luck 等)?
4. 权益是否只在服务端裁剪?
5. 关系理解是否仍在 P1 路径中(双引擎)?
6. 数据模型是否留有 Memory / Consult 扩展位(不阻塞 P1)?