feat: Phase 1 mobile tablet — Jenkins APK, PC tab, in-app update

Capacitor 확장으로 git push 시 Mobile Jenkins 빌드, PC 탭 Android/iPad 다운로드,
앱 내 APK 업데이트, iOS TestFlight API 및 Capacitor ios 프로젝트를 추가한다.

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

app/src/App.tsx

@@ -8,6 +8,7 @@ import { TradeNotificationProvider, useTradeNotification } from './contexts/Trad
 import { useAppSettings, resolveAppDefaults } from './hooks/useAppSettings';
 import TabBar, { type TabId } from './components/TabBar';
 import LiveSignalBridge from './components/LiveSignalBridge';
+import AppUpdateGate from './components/AppUpdateGate';
 import LoginScreen from './screens/LoginScreen';
 import '@frontend/styles/splashScreen.css';
 import './theme/global.css';
@@ -116,7 +117,9 @@ function AppRoot() {
         popupEnabled={false}
         settingsSessionKey={sessionKey}
       >
-        <MainApp />
+        <AppUpdateGate>
+          <MainApp />
+        </AppUpdateGate>
       </TradeNotificationProvider>
     </NavigationProvider>
   );