chore(deploy): add same-host staging stack next to production

dev deploys to /opt/dukang-staging (819x, *-test domains); main deploys to production. Staging uses full Mock with shared WeChat app ids.

Co-authored-by: Cursor <cursoragent@cursor.com>

AGENTS.md

@@ -137,6 +137,19 @@ C 端门店仅 status=OPEN
 订单 Tab：待付款 | 已付款 | 已完成
 ```
 
+## 环境与发版
+
+| 环境 | 分支 | 目录 | 端口 | 域名 |
+|------|------|------|------|------|
+| local | `dev_jacy` | 本机 Docker 6016/6017 | API `:3000` | — |
+| **staging 测试** | `dev` | `/opt/dukang-staging` | 8190–8194 | `*-test.dukanghaoke.com` |
+| **production 生产** | `main` | `/opt/dukang` | 8090–8094 | `*.dukanghaoke.com` |
+
+- 日常发布 → `deploy/deploy-staging.sh`（`dev`）
+- 生产发布 → `deploy/deploy-prod.sh`（`main`，验收后）
+- Staging：正式微信 + 全 Mock；配置见 `.env.staging.example`
+- 详情：`@dukang-release` / `.cursor/skills/dukang-release/SKILL.md`
+
 ## 提交与 PR
 
 - Conventional Commits：`feat(trade):`、`fix(redeem):`；scope = 端或模块