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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jackyu66git
2026-08-02 16:12:10 +08:00
co-authored by Cursor
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# Architecture
Go 包边界(冻结):[architecture/go-services.md](architecture/go-services.md)
Domain / ERD[domain/domain-map.md](domain/domain-map.md) · [domain/erd.md](domain/erd.md)
## Allowed call graph
```