fix:错误码处理

apps/frontend/src/features/auth/pages/RegisterPage.vue

@@ -18,6 +18,17 @@ const isLoading = ref(false);
 const errorMessage = ref('');
 
 const submit = async () => {
+  const email = form.email.trim();
+  const displayName = form.displayName.trim();
+
+  if (!displayName) {
+    errorMessage.value = '请输入昵称';
+    return;
+  }
+  if (!email) {
+    errorMessage.value = '请输入邮箱地址';
+    return;
+  }
   if (form.password !== form.confirmPassword) {
     errorMessage.value = '两次输入的密码不一致';
     return;
@@ -27,18 +38,28 @@ const submit = async () => {
   errorMessage.value = '';
   try {
     const payload = {
-      email: form.email,
+      email,
       password: form.password,
       confirmPassword: form.confirmPassword,
-      displayName: form.displayName,
+      displayName,
       preferredCurrency: 'CNY'
     };
     const { data } = await apiClient.post('/auth/register', payload);
     authStore.setSession(data.tokens, data.user);
     router.push('/');
-  } catch (error) {
-    console.warn('register failed', error);
-    errorMessage.value = '注册失败，请稍后再试或联系支持。';
+  } catch (err: any) {
+    console.warn('register failed', err);
+    const status = err?.response?.status as number | undefined;
+    const backendMsg = err?.response?.data?.message as string | undefined;
+    if (!status) {
+      errorMessage.value = '无法连接服务器，请检查网络或 API 地址配置。';
+    } else if (status === 409) {
+      errorMessage.value = '该邮箱已注册，请直接登录或使用“忘记密码”。';
+    } else if (status === 400 || status === 422) {
+      errorMessage.value = backendMsg ?? '输入不合法，请检查表单内容。';
+    } else {
+      errorMessage.value = backendMsg ?? '注册失败，请稍后再试或联系支持。';
+    }
   } finally {
     isLoading.value = false;
   }