feat(api/client): 优化添加客户端接口

- 在请求体中增加 email 参数，允许自定义用户邮箱
- 如果请求体中未提供 email，则使用随机生成的 UUID 作为邮箱
- 优化了代码结构，提高了可读性和可维护性

api/client/add.js

@@ -5,7 +5,7 @@ const getCookie = require("../../auth/3xuiLogin");
 const { log } = require("console");
 
 module.exports = async (ctx) => {
-  let { id = 4, limitIp, expiryTime = 0, enable = !0, totalGB = 1, subId = "2rv0gb458kbfl532" } = ctx.request.body;
+  let { id = 4, limitIp, expiryTime = 0, enable = !0, totalGB = 1, subId = "2rv0gb458kbfl532", email } = ctx.request.body;
   if (!ctx.state.cookie) {
     ctx.state.cookie = await getCookie();
     ins.interceptors.request.use((config) => {
@@ -15,8 +15,8 @@ module.exports = async (ctx) => {
   }
   const inbound = await ins.get(`/panel/api/inbounds/get/${id}`);
   if (!inbound?.success) return (ctx.body = { code: "1", msg: "获取节点失败" });
-  const uuid = randomUUID(),
-    email = uuid.split("-")[0];
+  const uuid = randomUUID();
+  email = email || uuid.split("-")[0];
   if (expiryTime > 0) {
     expiryTime = dayjs(expiryTime, "YYYY-MM-DD HH:mm:ss").valueOf();
   }