feat: refine proxy export and toolbar layout

frontend/src/components/admin/account/AccountTableActions.vue

@@ -6,6 +6,7 @@
     </button>
     <slot name="after"></slot>
     <button @click="$emit('sync')" class="btn btn-secondary">{{ t('admin.accounts.syncFromCrs') }}</button>
+    <slot name="beforeCreate"></slot>
     <button @click="$emit('create')" class="btn btn-primary">{{ t('admin.accounts.createAccount') }}</button>
     <slot name="afterCreate"></slot>
   </div>