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jackyu66gitandCursor 2fb1dfee14 chore: seal Design Vision v1 and monorepo scaffold
Archive the differentiated YuXinGu product docs, AI engineering system,
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over early innovation (see .ai/product/STRATEGY.md).

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# 03 REST API 规范
## URL
- 前缀:`/api/v1`
- 资源名词复数、层级清晰:
```
GET /api/v1/users
GET /api/v1/users/:id
POST /api/v1/users
PUT /api/v1/users/:id
DELETE /api/v1/users/:id
```
动作型可用子路径:`POST /api/v1/reports/decode`
## 统一响应
成功:
```json
{ "code": 0, "message": "success", "data": {} }
```
失败(HTTP 可用 4xx/5xxbody 仍带业务码):
```json
{ "code": 10001, "message": "user not found" }
```
## 错误码段(约定)
| 段 | 含义 |
|---|---|
| 0 | 成功 |
| 1xxxx | 通用 / 参数 / 认证 |
| 2xxxx | 用户与档案 |
| 3xxxx | 报告与量表 |
| 4xxxx | 订单与会员 |
| 5xxxx | AI / 陪伴 |
具体码表维护在 `apps/docs/api-errors.md`(随功能追加)。
## 分页
```
GET /api/v1/scales?page=1&page_size=20
```
`data` 建议:
```json
{ "list": [], "total": 0, "page": 1, "page_size": 20 }
```
## 版本与文档
- 破坏性变更升 `/api/v2` 或并行兼容期。
- 同步更新 `proto/openapi.yaml`