fix(login): noMobile 阶段后端将 openId 放 bindKey 字段返回，纳入兜底链

src/pages/login/index.tsx

@@ -36,8 +36,11 @@ export default function Login() {
     const state = getLoginSubState(result)
     if (state !== 'complete') {
       console.log('[login-page] 注册未完成，推进到', state)
-      // noMobile 响应可能不回传 openId（首次 needUserInfo 已缓存本地），从 storage 兜底
-      const openIdNext = result.openId ?? storage.get<string>(WX_OPENID_STORAGE_KEY) ?? openId
+      // openId 兜底链：noMobile 阶段后端把 openId 放在 bindKey 字段返回（联调实测）；
+      // 其余阶段从本地缓存（needUserInfo 时已写入）兜底
+      const openIdNext =
+        result.openId ?? (state === 'noMobile' ? result.bindKey : undefined) ??
+        storage.get<string>(WX_OPENID_STORAGE_KEY) ?? openId
       if (!openIdNext) throw new Error('响应缺少 openId，无法继续授权')
       setOpenId(openIdNext)
       setSubState(state)