[fix]:[FL-202][调整ATP模型创建弹窗宽度]

移除width={760}，使用Ant Design默认宽度（520px），与用户管理的用户新增表单保持一致

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: multica-agent <github@multica.ai>

web/src/app/admin/atp-models/page.tsx

@@ -727,7 +727,6 @@ export default function AtpModelsPage() {
         onOk={() => void form.submit()}
         confirmLoading={createAssetMutation.isPending}
         destroyOnClose
-        width={760}
         okText={createAssetMutation.isPending ? "提交中..." : "创建模型"}
         cancelText="取消"
       >