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/Core/Push/PushAPI.swift

@@ -0,0 +1,32 @@
+//
+//  PushAPI.swift
+//  suixinkan
+//
+//  Created by Codex on 2026/6/26.
+//
+
+import Foundation
+import Observation
+
+@MainActor
+@Observable
+/// 推送 API，负责把 iOS APNs token 上报到当前后端兼容接口。
+final class PushAPI {
+    @ObservationIgnored private let client: APIClient
+
+    /// 初始化推送 API，并注入共享网络客户端。
+    init(client: APIClient) {
+        self.client = client
+    }
+
+    /// 上报 APNs device token。后端当前沿用 Android/JPush 字段名。
+    func registerJPushId(_ registrationId: String) async throws {
+        let _: EmptyPayload = try await client.send(
+            APIRequest(
+                method: .post,
+                path: "/api/app/user/register-jpush-id",
+                queryItems: [URLQueryItem(name: "jpush_reg_id", value: registrationId)]
+            )
+        )
+    }
+}