feat(api): 接入微信登录并原生实现咨询域（ECR-049/050）

小程序可在 Go 上完成微信手机号登录、测评、预约和下单，不再反代 Java。 Co-authored-by: Cursor <cursoragent@cursor.com>
2026-09-15 00:26:29 +08:00
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+# Backend Design: ECR-049 WeChat Auth + Consult Gateway
+
+| Field | Value |
+|-------|-------|
+| ID | BD-2026-049 |
+| Status | **Approved** |
+| Coding | **In progress** |
+| Migration | `000058_wechat_auth_gateway` |
+
+## Boundary
+
+```text
+POST /api/v1/auth/wechat
+  { code, encryptedData, iv } → existing SessionResult
+users.wx_openid UNIQUE · wx_unionid · java_platform_user_id
+user_sessions.java_access_token
+ANY /api/app-api/*  → JAVA_BASE/app-api/*   (Go Bearer → Java Bearer)
+ANY /api/admin-api/* → JAVA_BASE/admin-api/*
+Java POST /app-api/oauth/internal/issue-mini-app  (X-Internal-Key)
+Identity: wx_openid = t_platform_user_account.account (mini_app)
+          phone     = t_platform_user.mobile
+```
+
+## Out
+
+Module migrate · Java decommission · Admin auth · auto ECR-050