Add: Auto-Updater fuer Electron App

- Server: /updates Endpoint fuer Squirrel.Windows Update-Feed
- Electron: autoUpdater mit 30min Check-Intervall
- Preload: IPC-Events fuer Update-Status ans Frontend

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

electron/main.js

@@ -1,4 +1,4 @@
-const { app, BrowserWindow, session, shell, desktopCapturer } = require('electron');
+const { app, BrowserWindow, session, shell, desktopCapturer, autoUpdater } = require('electron');
 const path = require('path');
 const { setupAdBlocker } = require('./ad-blocker');
 
@@ -11,6 +11,43 @@ try {
 
 const HUB_URL = process.env.GAMING_HUB_URL || 'https://hub.daddelolymp.de';
 
+function setupAutoUpdater() {
+  if (process.platform !== 'win32') return;
+
+  const updateURL = `${HUB_URL}/updates`;
+  try {
+    autoUpdater.setFeedURL({ url: updateURL });
+  } catch (e) {
+    console.error('[AutoUpdater] setFeedURL failed:', e.message);
+    return;
+  }
+
+  autoUpdater.on('update-available', () => {
+    console.log('[AutoUpdater] Update available, downloading...');
+  });
+
+  autoUpdater.on('update-downloaded', (_event, releaseNotes, releaseName) => {
+    console.log('[AutoUpdater] Update downloaded:', releaseName || 'new version');
+  });
+
+  autoUpdater.on('update-not-available', () => {
+    console.log('[AutoUpdater] App is up to date.');
+  });
+
+  autoUpdater.on('error', (err) => {
+    console.error('[AutoUpdater] Error:', err.message);
+  });
+
+  // Check for updates after 5 seconds, then every 30 minutes
+  setTimeout(() => {
+    try { autoUpdater.checkForUpdates(); } catch (e) { console.error('[AutoUpdater]', e.message); }
+  }, 5000);
+
+  setInterval(() => {
+    try { autoUpdater.checkForUpdates(); } catch (e) { console.error('[AutoUpdater]', e.message); }
+  }, 30 * 60 * 1000);
+}
+
 let mainWindow;
 
 function createWindow() {
@@ -64,7 +101,10 @@ function createWindow() {
   });
 }
 
-app.whenReady().then(createWindow);
+app.whenReady().then(() => {
+  createWindow();
+  setupAutoUpdater();
+});
 
 app.on('window-all-closed', () => {
   if (process.platform !== 'darwin') app.quit();