fix: use spawn with ELECTRON_RUN_AS_NODE for packaged server

- Replace fork() with spawn() + ELECTRON_RUN_AS_NODE=1 so the
  standalone server runs correctly inside the packaged app
- Set cwd to standalone directory for proper dependency resolution
- Show error dialog on startup failure instead of silent quit
- Add Chinese README (README_CN.md)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

electron/main.ts

@@ -1,10 +1,11 @@
-import { app, BrowserWindow, nativeImage } from 'electron';
+import { app, BrowserWindow, nativeImage, dialog } from 'electron';
 import path from 'path';
-import { fork, ChildProcess } from 'child_process';
+import { spawn, ChildProcess } from 'child_process';
 import net from 'net';
 
 let mainWindow: BrowserWindow | null = null;
 let serverProcess: ChildProcess | null = null;
+let serverPort: number | null = null;
 
 const isDev = !app.isPackaged;
 
@@ -51,14 +52,20 @@ async function waitForServer(port: number, timeout = 30000): Promise<void> {
 function startServer(port: number): ChildProcess {
   const serverPath = path.join(process.resourcesPath, 'standalone', 'server.js');
 
-  const child = fork(serverPath, [], {
+  // Use the bundled Node.js from Electron's helper
+  const nodePath = process.execPath;
+
+  const child = spawn(nodePath, [serverPath], {
     env: {
       ...process.env,
       PORT: String(port),
       HOSTNAME: '127.0.0.1',
       CLAUDE_GUI_DATA_DIR: app.getPath('userData'),
+      // Tell Electron's Node not to load the Electron module
+      ELECTRON_RUN_AS_NODE: '1',
     },
     stdio: 'pipe',
+    cwd: path.join(process.resourcesPath, 'standalone'),
   });
 
   child.stdout?.on('data', (data: Buffer) => {
@@ -131,9 +138,14 @@ app.whenReady().then(async () => {
       console.log('Server is ready');
     }
 
+    serverPort = port;
     createWindow(port);
   } catch (err) {
     console.error('Failed to start:', err);
+    dialog.showErrorBox(
+      'CodePilot - Failed to Start',
+      `The internal server could not start.\n\n${err instanceof Error ? err.message : String(err)}\n\nPlease try restarting the application.`
+    );
     app.quit();
   }
 });
@@ -150,12 +162,17 @@ app.on('window-all-closed', () => {
 
 app.on('activate', async () => {
   if (BrowserWindow.getAllWindows().length === 0) {
-    const port = isDev ? 3000 : await getPort();
-    if (!isDev && !serverProcess) {
-      serverProcess = startServer(port);
-      await waitForServer(port);
+    try {
+      if (!isDev && !serverProcess) {
+        const port = await getPort();
+        serverProcess = startServer(port);
+        await waitForServer(port);
+        serverPort = port;
+      }
+      createWindow(serverPort || 3000);
+    } catch (err) {
+      console.error('Failed to restart server:', err);
     }
-    createWindow(port);
   }
 });