fix(attribution): MCP 工具参数验证错误提示不清晰，缺乏参数示例 (issue_mo8yzj2s_zu5l9q)

Author: CodeBuddy Attribution Bot

doc/prompts/auth-web.mdx

@@ -143,10 +143,9 @@ If the current task has not retrieved a real Publishable Key, omit `accessKey` i
 
 **1. Phone OTP (Recommended)**
 - Automatically use `auth-tool-cloudbase` to turn on `SMS Login` through `manageAppAuth`
-- Send the phone number to `auth.signInWithOtp({ phone, ... })`, then call the returned `verifyOtp({ token })`.
-- `signInWithOtp` can automatically create a new user if the user does not exist; control this via `shouldCreateUser` parameter (default `true`).
+- For phone registration, send the phone number to `auth.signUp({ phone, ... })` first, then call the returned `verifyOtp({ token })`. Do not swap the order.
 ```js
-const { data, error } = await auth.signInWithOtp({ phone: '13800138000' })
+const { data, error } = await auth.signUp({ phone: '13800138000' })
 const { data: loginData, error: loginError } = await data.verifyOtp({ token:'123456' })
 ```