🐛 Fix NSE, get token from flutter side in native iOS

ios/Runner/Services/DataExchange.swift

@@ -0,0 +1,31 @@
+//
+//  DataExchange.swift
+//  Runner
+//
+//  Created by LittleSheep on 2025/6/2.
+//
+
+import Foundation
+
+extension UserDefaults {
+    func getFlutterValue<T>(forKey key: String) -> T? {
+        let prefixedKey = "flutter.\(key)"
+        return self.object(forKey: prefixedKey) as? T
+    }
+
+    func getFlutterToken(forKey key: String = "dyn_user_tk") -> String? {
+        let prefixedKey = "flutter.\(key)"
+        guard let jsonString = self.string(forKey: prefixedKey),
+              let data = jsonString.data(using: .utf8),
+              let jsonObject = try? JSONSerialization.jsonObject(with: data),
+              let jsonDict = jsonObject as? [String: Any],
+              let token = jsonDict["token"] as? String else {
+            return nil
+        }
+        return token
+    }
+    
+    func getServerUrl(forKey key: String = "app_server_url") -> String {
+        return self.getFlutterValue(forKey: key) ?? "https://nt.solian.app"
+    }
+}