feat: add complete Mayday iOS Xcode project

- Swift 6, SwiftUI, MVVM + async/await architecture
- iOS 17.0 minimum deployment target
- Two targets: Mayday app + MaydayLiveActivity widget extension
- Models: UserResponse, TokenPair, AppNotification, SessionResponse, AlertAttributes
- Services: HTTPClient (actor), AuthService, KeychainService, NotificationsAPIService, PushNotificationService
- ViewModels: AuthViewModel, NotificationsViewModel, SettingsViewModel
- Views: Login/Register/VerifyEmail, NotificationsList/Detail, Settings/ChangePassword/Sessions
- APNs push notifications with UIApplicationDelegate
- ActivityKit Live Activities for Dynamic Island + Lock Screen
- Keychain (Security framework) token storage
- 30-second polling with pagination for notifications
- Xcode project file (project.pbxproj) with correct build phases for both targets

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Mayday/ContentView.swift

@@ -0,0 +1,18 @@
+import SwiftUI
+
+struct ContentView: View {
+    @EnvironmentObject var authViewModel: AuthViewModel
+
+    var body: some View {
+        Group {
+            if authViewModel.isAuthenticated {
+                NotificationsView()
+            } else {
+                LoginView()
+            }
+        }
+        .task {
+            await authViewModel.checkAuthStatus()
+        }
+    }
+}