feat: auto-updater integration

- Install electron-updater
- New updater.ts: check/download/install with progress events
- IPC: updater:check, updater:download, updater:install, updater:status
- Preload bridge for updater API
- electron-builder publish config (github provider)
- Fix build files path: out -> electron-dist
- i18n keys for updater notifications (zh-CN + en)

src/i18n/locales/en.ts

@@ -166,6 +166,16 @@ export default {
     clear: 'Clear',
     empty: 'No commands recorded',
   },
+  updater: {
+    checking: 'Checking for updates...',
+    available: 'New version {version} available',
+    notAvailable: 'You are up to date',
+    downloading: 'Downloading... {percent}%',
+    downloaded: 'Update downloaded. Restart now?',
+    install: 'Restart Now',
+    later: 'Later',
+    error: 'Update failed: {message}',
+  },
   status: {
     title: 'Status',
     database: 'Database',

src/i18n/locales/zh-CN.ts

@@ -166,6 +166,16 @@ export default {
     clear: '清空',
     empty: '暂无命令记录',
   },
+  updater: {
+    checking: '正在检查更新...',
+    available: '发现新版本 {version}',
+    notAvailable: '已是最新版本',
+    downloading: '正在下载... {percent}%',
+    downloaded: '更新已下载，重启安装？',
+    install: '立即重启',
+    later: '稍后',
+    error: '更新失败: {message}',
+  },
   status: {
     title: '状态',
     database: '数据库',