fix: 修复iOS抖音支付回跳注册

uni_modules/tb-douyin-pay/package.json

@@ -1,7 +1,7 @@
 {
   "id": "tb-douyin-pay",
   "displayName": "TB 抖音支付",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "独立实现的抖音支付官方 SDK UTS 桥接",
   "engines": { "HBuilderX": ">=4.36.0" },
   "uni_modules": {

uni_modules/tb-douyin-pay/utssdk/app-ios/TbDouyinPayNative.swift

@@ -7,7 +7,13 @@ public class TbDouyinPayNative {
     private static var generation = UUID()
 
     public static func initialize(_ appId: String, _ scheme: String, _ link: String) {
-        DypayAPI.register(withAppID: appId, universalLink: link, callbackScheme: scheme)
+        if link.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
+            // Use the SDK's Scheme-only API instead of registering an empty
+            // Universal Link with the higher-priority Universal Link API.
+            DypayAPI.register(withAppID: appId, callbackScheme: scheme)
+        } else {
+            DypayAPI.register(withAppID: appId, universalLink: link, callbackScheme: scheme)
+        }
     }
 
     public static func available() -> Bool { DypayAPI.canOpenDypay() }