feat: CDP remote debugging + screenshot IPC handler

electron/main.ts

@@ -3,6 +3,11 @@ import * as path from 'path';
 import { spawn, execSync, ChildProcess } from 'child_process';
 import * as fs from 'fs';
 
+// 远程调试端口 — Val 通过 CDP 远程控制窗口
+const REMOTE_DEBUG_PORT = 9222;
+app.commandLine.appendSwitch('remote-debugging-port', String(REMOTE_DEBUG_PORT));
+app.commandLine.appendSwitch('remote-debugging-address', '0.0.0.0');
+
 let mainWindow: BrowserWindow | null = null;
 let overlayProcess: ChildProcess | null = null;
 let monitorProcess: ChildProcess | null = null;
@@ -204,6 +209,13 @@ ipcMain.handle('open-external', async (_event, url: string) => {
 });
 ipcMain.handle('get-resources-path', () => process.resourcesPath);
 ipcMain.handle('fs:exists', (_event, p: string) => fs.existsSync(p));
+ipcMain.handle('app:screenshot', async () => {
+  if (mainWindow && !mainWindow.isDestroyed()) {
+    const img = await mainWindow.webContents.capturePage();
+    return { success: true, data: img.toPNG().toString('base64') };
+  }
+  return { success: false, error: 'No window' };
+});
 
 // === 应用生命周期 ===
 app.whenReady().then(createWindow);