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/Services/NotificationsAPIService.swift

@@ -0,0 +1,46 @@
+import Foundation
+import UIKit
+
+actor NotificationsAPIService {
+    static let shared = NotificationsAPIService()
+    private let client = HTTPClient.shared
+
+    private init() {}
+
+    func getNotifications(page: Int = 1, perPage: Int = 20) async throws -> NotificationsPage {
+        try await client.request(.getNotifications(page: page, perPage: perPage))
+    }
+
+    func markAsRead(id: UUID) async throws {
+        let _: AppNotification = try await client.request(.markAsRead(id: id))
+    }
+
+    func getSessions() async throws -> [SessionResponse] {
+        try await client.request(.getSessions)
+    }
+
+    func deleteSession(id: UUID) async throws {
+        let _: EmptyResponse = try await client.request(.deleteSession(id: id))
+    }
+
+    func logoutAll() async throws -> Int {
+        let response: LogoutAllResponse = try await client.request(.logoutAll)
+        return response.revokedSessions
+    }
+
+    func changePassword(current: String, new: String) async throws -> UserResponse {
+        try await client.request(.changePassword(current: current, new: new))
+    }
+
+    func updateAppBadge(_ count: Int) async {
+        await UIApplication.shared.setApplicationIconBadgeNumber(count)
+    }
+}
+
+struct LogoutAllResponse: Decodable {
+    let revokedSessions: Int
+
+    enum CodingKeys: String, CodingKey {
+        case revokedSessions = "revoked_sessions"
+    }
+}