Add APNs push notification registration and payload routing.

Introduce AppDelegate, explicit Info.plist and entitlements, and wire PushNotificationManager into login lifecycle for device token upload and notification handling.

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

suixinkan/App/AppDelegate.swift

@@ -0,0 +1,41 @@
+//
+//  AppDelegate.swift
+//  suixinkan
+//
+//  Created by Codex on 2026/6/26.
+//
+
+import UIKit
+
+/// AppDelegate 承接 APNs 系统回调，SwiftUI App 入口通过 adaptor 注入。
+final class AppDelegate: NSObject, UIApplicationDelegate {
+    func application(
+        _ application: UIApplication,
+        didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data
+    ) {
+        Task { @MainActor in
+            PushNotificationManager.shared.handleDeviceToken(deviceToken)
+        }
+    }
+
+    func application(
+        _ application: UIApplication,
+        didFailToRegisterForRemoteNotificationsWithError error: Error
+    ) {
+        Task { @MainActor in
+            PushNotificationManager.shared.handleRegistrationError(error)
+        }
+    }
+
+    func application(
+        _ application: UIApplication,
+        didReceiveRemoteNotification userInfo: [AnyHashable: Any],
+        fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void
+    ) {
+        let payload = PushPayload(userInfo: userInfo)
+        Task { @MainActor in
+            PushNotificationManager.shared.handleRemoteNotification(payload)
+            completionHandler(.newData)
+        }
+    }
+}