feat(electron): add persistent auth, auto-updater, and NAS copy script

- Integrate electron-store for persistent PocketBase auth backup
  across localStorage clears and app reinstalls
- Switch build target from portable to nsis to generate latest.yml
  for electron-updater generic provider
- Add user confirmation dialogs before download and before install
- Add post-build script to copy .exe/.yml/.nupkg to NAS share and
  local electron-update/ directory for nginx volume mount
- Mount ./electron-update into frontend nginx containers via
  docker-compose for automatic update file serving

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

electron/main.js

@@ -1,5 +1,22 @@
-const { app, BrowserWindow, session } = require('electron')
+const { app, BrowserWindow, session, dialog, ipcMain } = require('electron')
+const { autoUpdater } = require('electron-updater')
 const path = require('path')
+const Store = require('electron-store')
+
+const store = new Store()
+
+// 同步 IPC：供 preload 读写持久化数据
+ipcMain.on('store-get-sync', (event, key) => {
+  event.returnValue = store.get(key)
+})
+ipcMain.on('store-set-sync', (event, key, value) => {
+  store.set(key, value)
+  event.returnValue = true
+})
+ipcMain.on('store-delete-sync', (event, key) => {
+  store.delete(key)
+  event.returnValue = true
+})
 
 const ENV_URLS = {
   dev: 'http://192.168.1.14:7033',
@@ -15,11 +32,19 @@ function getWindowUrl() {
   return ENV_URLS.dev
 }
 
+function getEnvName() {
+  const url = getWindowUrl()
+  if (url.includes('7034')) return 'uat'
+  return 'dev'
+}
+
 // 在 Chromium 启动前将 HTTP 内网地址标记为安全源，
 // 否则 navigator.mediaDevices 在 HTTP 非 localhost 下会被置空
 const insecureOrigins = Object.values(ENV_URLS).join(',')
 app.commandLine.appendSwitch('unsafely-treat-insecure-origin-as-secure', insecureOrigins)
 
+let mainWindow = null
+
 function createWindow() {
   const win = new BrowserWindow({
     width: 1280,
@@ -36,6 +61,8 @@ function createWindow() {
     },
   })
 
+  mainWindow = win
+
   const url = getWindowUrl()
   win.loadURL(url)
 
@@ -44,6 +71,101 @@ function createWindow() {
     event.preventDefault()
     win.setTitle(`Game Group - ${title}`)
   })
+
+  win.on('closed', () => {
+    mainWindow = null
+  })
+
+  return win
+}
+
+// 自动更新配置
+function setupAutoUpdater(win) {
+  const env = getEnvName()
+  const feedUrl = `${ENV_URLS[env]}/electron-update/`
+
+  autoUpdater.setFeedURL({ provider: 'generic', url: feedUrl })
+  autoUpdater.autoDownload = false
+  autoUpdater.autoInstallOnAppQuit = false
+
+  autoUpdater.on('checking-for-update', () => {
+    console.log('[updater] Checking for update at', feedUrl)
+  })
+
+  autoUpdater.on('update-available', (info) => {
+    console.log('[updater] Update available:', info.version)
+    if (win && !win.isDestroyed()) {
+      win.webContents.send('update-available', info)
+      dialog.showMessageBox(win, {
+        type: 'info',
+        title: '发现新版本',
+        message: `发现新版本 ${info.version}，是否立即下载更新？`,
+        buttons: ['立即下载', '稍后再说'],
+        defaultId: 0,
+        cancelId: 1,
+      }).then(({ response }) => {
+        if (response === 0) {
+          autoUpdater.downloadUpdate().catch((err) => {
+            console.error('[updater] Download failed:', err.message)
+          })
+        }
+      })
+    }
+  })
+
+  autoUpdater.on('update-not-available', () => {
+    console.log('[updater] No update available')
+  })
+
+  autoUpdater.on('error', (err) => {
+    console.error('[updater] Error:', err.message)
+    if (win && !win.isDestroyed()) {
+      win.webContents.send('update-error', err.message)
+    }
+  })
+
+  autoUpdater.on('download-progress', (progress) => {
+    console.log(`[updater] Download progress: ${progress.percent.toFixed(1)}%`)
+    if (win && !win.isDestroyed()) {
+      win.webContents.send('download-progress', progress)
+    }
+  })
+
+  autoUpdater.on('update-downloaded', (info) => {
+    console.log('[updater] Update downloaded:', info.version)
+    if (win && !win.isDestroyed()) {
+      win.webContents.send('update-downloaded', info)
+      dialog.showMessageBox(win, {
+        type: 'info',
+        title: '更新就绪',
+        message: `新版本 ${info.version} 已下载完成，是否立即重启安装？`,
+        buttons: ['立即重启', '稍后'],
+        defaultId: 0,
+      }).then(({ response }) => {
+        if (response === 0) {
+          autoUpdater.quitAndInstall()
+        }
+      })
+    }
+  })
+
+  // 手动触发检查更新（供前端调用）
+  ipcMain.on('check-for-updates', () => {
+    autoUpdater.checkForUpdates().catch((err) => {
+      console.error('[updater] Manual check failed:', err.message)
+    })
+  })
+
+  ipcMain.on('quit-and-install', () => {
+    autoUpdater.quitAndInstall()
+  })
+
+  // 启动后延迟 5 秒检查更新（等窗口稳定后再检查）
+  setTimeout(() => {
+    autoUpdater.checkForUpdates().catch((err) => {
+      console.error('[updater] Initial check failed:', err.message)
+    })
+  }, 5000)
 }
 
 app.whenReady().then(() => {
@@ -64,7 +186,8 @@ app.whenReady().then(() => {
     return false
   })
 
-  createWindow()
+  const win = createWindow()
+  setupAutoUpdater(win)
 })
 
 app.on('window-all-closed', () => {