更新代码仓库相关功能，修改 API 参数，添加删除仓库功能，更新文档和测试用例

create-repo-test.ts

@@ -0,0 +1,14 @@
+import { CNB } from './src/index.ts';
+
+const cnb = new CNB({
+  token: 'cIDfLOOIr1Trt15cdnwfndupEZG',
+  cookie: ''
+});
+
+const res = await cnb.repo.createRepo('kevisual', {
+  name: 'exam-kevisual',
+  description: 'exam repository for kevisual',
+  visibility: 'public'
+});
+
+console.log('Result:', JSON.stringify(res, null, 2));