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>

apps/docs/README.md

@@ -8,14 +8,12 @@
 
 ## 阅读顺序（产品重设计）
 
-1. [analysis/cece-teardown.md](analysis/cece-teardown.md) — 测测拆解 → 愈心谷映射  
-2. [`.ai/product/cece-feature-map.md`](../../.ai/product/cece-feature-map.md) — 测测 Feature Map（IA × 能力域）  
-3. [`.ai/product/feature-map.md`](../../.ai/product/feature-map.md) — 愈心谷 Feature Map + MVP  
-4. [prd-mvp.md](prd-mvp.md) — MVP 目标、IA、用户故事、API 切片、验收  
-5. [business-model.md](business-model.md) — 三层收入与飞轮  
-6. [product-roadmap.md](product-roadmap.md) — Phase A→D 竖切计划  
+1. [`.ai/product/ENGINEERING-FREEZE.md`](../../.ai/product/ENGINEERING-FREEZE.md) — P1 真源索引  
+2. [lexicon](../../.ai/product/lexicon.md) · [user-journey](../../.ai/product/user-journey.md) · [feature-map](../../.ai/product/feature-map.md) · [page-tree](../../.ai/product/page-tree.md)  
+3. [prd-mvp.md](prd-mvp.md) · [business-model.md](business-model.md) · [product-roadmap.md](product-roadmap.md)  
+4. 工程：[erd](../../.ai/domain/erd.md) · [openapi](../../proto/openapi.yaml) · [go-services](../../.ai/architecture/go-services.md)  
 
-域词汇：[`.ai/domain.md`](../../.ai/domain.md) · 领域图：[`.ai/domain/domain-map.md`](../../.ai/domain/domain-map.md)
+竞品对照勿抄 UI：`analysis/cece-teardown.md`
 
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