refactor(api): 优化用户协议接口

- 将 userAgreement 函数直接导出，简化模块结构
- 删除多余的空行，提高代码可读性

api/agreement.js

@@ -1,15 +1,11 @@
 import http from '../common/axios.js'
 
+export default {
     //获取用户协议
-function userAgreement(data) {
+    userAgreement(data) {
         let url = '/agreement/' + data
         return http.get(url, data).then(res => {
             return res;
         })
     }
-
-
-
-export default {
-	userAgreement,
 }