feat: support balance query for CloseAI (#240)

* 增加CloseAI余额查询功能

* 去除debug代码

* fix: bug fix

* docs: update README

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Co-authored-by: sudongyang <sudongyang@xiaomi.com>
Co-authored-by: JustSong <songquanpeng@foxmail.com>

web/src/components/ChannelsTable.js

@@ -30,6 +30,9 @@ function renderType(type) {
 function renderBalance(type, balance) {
   switch (type) {
     case 1: // OpenAI
+      return <span>${balance.toFixed(2)}</span>;
+    case 4: // CloseAI
+      return <span>¥{balance.toFixed(2)}</span>;
     case 8: // 自定义
       return <span>${balance.toFixed(2)}</span>;
     case 5: // OpenAI-SB