refactor: 后端拆分为 src/server 模块，前端迁移至路由分页（Chat/Skills）；设置改为抽屉、新增工具卡片组件；提交测试用 .env

src/main.ts

@@ -1,6 +1,7 @@
 import { createApp } from "vue";
 import App from "./App.vue";
+import router from "./router";
 import "./index.css";
 import "highlight.js/styles/atom-one-dark.css";
 
-createApp(App).mount("#app");
+createApp(App).use(router).mount("#app");