fix(api): propagate requestId for register and reset-password

Backend requires X-Request-Id header from the verification code send
response. Wire requestId through email/auth-extra API returns, register
and forgot-password pages, and auth API request headers.

app/(auth)/register/page.tsx

@@ -40,6 +40,7 @@ export default function RegisterPage() {
   const [showPassword, setShowPassword] = useState(false)
   const [showConfirmPassword, setShowConfirmPassword] = useState(false)
   const [countdown, setCountdown] = useState(0)
+  const [requestId, setRequestId] = useState("")
   const {
     register,
     handleSubmit,
@@ -65,7 +66,8 @@ export default function RegisterPage() {
     const email = String(getValues("email") ?? "")
 
     try {
-      await sendEmailVerificationCode({ email, scene: "register" })
+      const rid = await sendEmailVerificationCode({ email, scene: "register" })
+      setRequestId(rid)
       setCountdown(60)
       notifySuccess("验证码已发送到你的邮箱")
     } catch (err) {
@@ -80,6 +82,7 @@ export default function RegisterPage() {
         email: data.email,
         password: data.password,
         vcode: data.vcode,
+        requestId,
       })
       storeLogin(user, ["consumer"])
       router.push("/")