feat: 更新端口默认值为51515，添加useKey以获取默认仓库ID，更新创建文件描述信息

agent/routes/issues/list.ts

@@ -1,5 +1,6 @@
 import { createSkill, tool } from '@kevisual/router';
 import { app, cnb } from '../../app.ts';
+import { useKey } from '@kevisual/context';
 
 // 查询 Issue 列表 repo是 kevisual/kevisual
 app.route({
@@ -25,7 +26,7 @@ app.route({
     })
   }
 }).define(async (ctx) => {
-  const repo = ctx.query?.repo;
+  const repo = ctx.query?.repo || useKey('CNB_REPO_SLUG_LOWERCASE');
   const state = ctx.query?.state;
   const keyword = ctx.query?.keyword;
   const labels = ctx.query?.labels;