refactor: 迁移到 @nuxt/ui@4

- https://ui.nuxt.com/docs/getting-started/migration/v4#changes-from-v3

app/pages/user/authenticate.vue

@@ -440,7 +440,7 @@ onMounted(() => {
                 name="mobile"
                 required
               >
-                <UButtonGroup class="w-full">
+                <UFieldGroup class="w-full">
                   <UInput
                     v-model="smsForm.mobile"
                     :disabled="final_loading"
@@ -467,7 +467,7 @@ onMounted(() => {
                     color="neutral"
                     variant="outline"
                   />
-                </UButtonGroup>
+                </UFieldGroup>
               </UFormField>
               <Transition name="pin-root">
                 <div
@@ -518,7 +518,7 @@ onMounted(() => {
                   name="mobile"
                   required
                 >
-                  <UButtonGroup class="w-full">
+                  <UFieldGroup class="w-full">
                     <UInput
                       v-model="forgetPasswordState.mobile"
                       :disabled="final_loading"
@@ -543,7 +543,7 @@ onMounted(() => {
                       class="text-xs font-bold"
                       color="neutral"
                     />
-                  </UButtonGroup>
+                  </UFieldGroup>
                 </UFormField>
                 <UFormField
                   label="验证码"