feat(desktop-client): 阶段4-6 Electron EXE 客户端（登录/课表/作业/通知/成绩/设置 + Socket.IO 实时 + IndexedDB 离线缓存与自动同步 + electron-builder 打包）

packages/desktop-client/src/renderer/main.ts

@@ -0,0 +1,29 @@
+import { createApp } from 'vue';
+import { createPinia } from 'pinia';
+import ElementPlus from 'element-plus';
+import zhCn from 'element-plus/es/locale/lang/zh-cn';
+import * as ElementPlusIconsVue from '@element-plus/icons-vue';
+import 'element-plus/dist/index.css';
+
+import App from './App.vue';
+import router from './router/index.js';
+import { registerSmokeHooks } from './cache/self-test.js';
+import './styles/index.css';
+
+const app = createApp(App);
+
+for (const [name, component] of Object.entries(ElementPlusIconsVue)) {
+  app.component(name, component);
+}
+
+app.use(createPinia());
+app.use(router);
+app.use(ElementPlus, { locale: zhCn });
+
+// 冒烟验证模式：把缓存自检钩子暴露给主进程调用（正常运行时不存在）
+if (window.desktop?.smokeTest) {
+  registerSmokeHooks();
+}
+
+await router.isReady();
+app.mount('#app');