Add debug bypass subscription toggle, tests, and data layer improvements

- Add runtime toggle in Settings (DEBUG only) to bypass subscription/hide trial banner
- IAPManager.bypassSubscription is now a @Published var persisted via UserDefaults
- Hide upgrade banner in SettingsTabView and trial warnings when bypass is enabled
- Add FeelsTests directory with integration tests
- Update DataController, DataControllerGET, DataControllerUPDATE
- Update Xcode project and scheme configuration
- Update localization strings and App Store screen docs

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

Shared/Views/SettingsView/SettingsTabView.swift

@@ -36,7 +36,7 @@ struct SettingsTabView: View {
                 .padding(.top, 8)
 
             // Upgrade Banner (only show if not subscribed)
-            if !iapManager.isSubscribed {
+            if !iapManager.isSubscribed && !iapManager.bypassSubscription {
                 UpgradeBannerView(
                     showWhyUpgrade: $showWhyUpgrade,
                     showSubscriptionStore: $showSubscriptionStore,