feat: desktop startup auto-update before main app launch

Check server version on launch, download/install/relaunch if newer,
then show the main UI. Manual update check no longer triggers full install.

Co-authored-by: Cursor <cursoragent@cursor.com>

desktop/src/bridge/updater.ts

@@ -65,17 +65,42 @@ export async function getAppVersion(): Promise<string> {
   return getVersion();
 }
 
-/** @deprecated runDesktopUpdate 사용 */
+/** 서버에 새 버전이 있는지만 확인 (다운로드·설치 없음) */
 export async function checkForUpdates(): Promise<{
   available: boolean;
   version?: string;
   message?: string;
 }> {
-  const result = await runDesktopUpdate();
+  try {
+    const currentVersion = await getVersion();
+    const update = await check();
+    if (!update) {
+      return { available: false, message: `최신 버전입니다. (v${currentVersion})` };
+    }
+    return {
+      available: true,
+      version: update.version,
+      message: `새 버전 v${update.version}을(를) 사용할 수 있습니다. (현재 v${currentVersion})`,
+    };
+  } catch (e) {
+    return { available: false, message: formatUpdateError(e) };
+  }
+}
+
+export interface StartupAutoUpdateResult {
+  /** false면 relaunch 중 — 메인 UI를 띄우지 않음 */
+  shouldContinue: boolean;
+  result: DesktopUpdateResult;
+}
+
+/** 앱 시작 시 — 새 버전이 있으면 자동 다운로드·설치·재시작 */
+export async function runStartupAutoUpdate(
+  onProgress?: (p: DesktopUpdateProgress) => void,
+): Promise<StartupAutoUpdateResult> {
+  const result = await runDesktopUpdate(onProgress);
   return {
-    available: result.phase === 'relaunching' || result.phase === 'available',
-    version: result.newVersion,
-    message: result.message,
+    shouldContinue: result.phase !== 'relaunching',
+    result,
   };
 }