remove Expo project and all related files

Remove the entire Expo/React Native application: routes (app/), source
code (src/), assets, iOS native build, config plugins, StoreKit config,
npm dependencies, TypeScript/ESLint/Vitest configs, and Expo-specific
documentation. The repository now contains only: admin-web, supabase,
youtube-worker, tabatago-swift, docs, scripts, and CI/tooling configs.

tabatago-swift/TabataGoWatch/App/TabataGoWatchApp.swift

@@ -0,0 +1,17 @@
+import SwiftUI
+import HealthKit
+
+@main
+struct TabataGoWatchApp: App {
+
+    @StateObject private var connectivityManager = WatchConnectivityManager.shared
+    @StateObject private var playerEngine = WatchPlayerEngine()
+
+    var body: some Scene {
+        WindowGroup {
+            WatchRootView()
+                .environmentObject(connectivityManager)
+                .environmentObject(playerEngine)
+        }
+    }
+}