Convert web app to Electron desktop application

- Add Electron main process with developer tools support
- Create preload script for secure context bridge
- Configure electron-builder for packaging
- Update Vite config for Electron compatibility (base: './')
- Add environment variable support for API host configuration
- Fix i18n to use relative paths for Electron file protocol
- Restore multi-port backend architecture (8081-8085)
- Add enhanced backend startup script with port checking
- Update package.json with Electron dependencies and build scripts

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

electron/main-simple.cjs

@@ -0,0 +1,132 @@
+const { app, BrowserWindow, Menu, shell, ipcMain } = require('electron');
+const path = require('path');
+
+// 全局变量
+let mainWindow = null;
+
+// 开发环境检测
+const isDev = process.env.NODE_ENV === 'development' || !app.isPackaged;
+
+// 防止多开
+const gotTheLock = app.requestSingleInstanceLock();
+
+if (!gotTheLock) {
+    app.quit();
+} else {
+    app.on('second-instance', () => {
+        if (mainWindow) {
+            if (mainWindow.isMinimized()) mainWindow.restore();
+            mainWindow.focus();
+        }
+    });
+}
+
+// 创建主窗口
+function createWindow() {
+    mainWindow = new BrowserWindow({
+        width: 1200,
+        height: 800,
+        minWidth: 800,
+        minHeight: 600,
+        title: 'Termix',
+        icon: path.join(__dirname, '..', 'public', 'icon.png'),
+        webPreferences: {
+            nodeIntegration: false,
+            contextIsolation: true,
+            preload: path.join(__dirname, 'preload-simple.cjs'),
+            webSecurity: !isDev
+        },
+        show: false,
+    });
+
+    // 创建应用菜单（包含开发者工具快捷键）
+    const template = [
+        {
+            label: 'View',
+            submenu: [
+                {
+                    label: 'Toggle Developer Tools',
+                    accelerator: process.platform === 'darwin' ? 'Alt+Command+I' : 'Ctrl+Shift+I',
+                    click: () => {
+                        mainWindow.webContents.toggleDevTools();
+                    }
+                },
+                {
+                    label: 'Reload',
+                    accelerator: 'CmdOrCtrl+R',
+                    click: () => {
+                        mainWindow.webContents.reload();
+                    }
+                }
+            ]
+        }
+    ];
+
+    const menu = Menu.buildFromTemplate(template);
+    Menu.setApplicationMenu(menu);
+
+    // 加载应用
+    if (isDev) {
+        // 开发环境：连接到 Vite 开发服务器
+        mainWindow.loadURL('http://localhost:5173');
+        mainWindow.webContents.openDevTools();
+    } else {
+        // 生产环境：加载构建后的文件
+        mainWindow.loadFile(path.join(__dirname, '..', 'dist', 'index.html'));
+        // 生产环境也启用开发者工具以便调试
+        mainWindow.webContents.openDevTools();
+    }
+
+    // 窗口准备好后显示
+    mainWindow.once('ready-to-show', () => {
+        mainWindow.show();
+    });
+
+    // 处理窗口关闭事件
+    mainWindow.on('closed', () => {
+        mainWindow = null;
+    });
+
+    // 处理外部链接
+    mainWindow.webContents.setWindowOpenHandler(({ url }) => {
+        shell.openExternal(url);
+        return { action: 'deny' };
+    });
+}
+
+// IPC 通信处理
+ipcMain.handle('get-app-version', () => {
+    return app.getVersion();
+});
+
+ipcMain.handle('get-platform', () => {
+    return process.platform;
+});
+
+// 应用事件处理
+app.whenReady().then(() => {
+    createWindow();
+});
+
+app.on('window-all-closed', () => {
+    if (process.platform !== 'darwin') {
+        app.quit();
+    }
+});
+
+app.on('activate', () => {
+    if (BrowserWindow.getAllWindows().length === 0) {
+        createWindow();
+    } else if (mainWindow) {
+        mainWindow.show();
+    }
+});
+
+// 处理未捕获的异常
+process.on('uncaughtException', (error) => {
+    console.error('Uncaught Exception:', error);
+});
+
+process.on('unhandledRejection', (reason, promise) => {
+    console.error('Unhandled Rejection at:', promise, 'reason:', reason);
+});