refactor: 支付链路规范化 — 统一命名/层次/传参

- ISDKHelper.pay() 增加 productPrice 参数，与 UnityKnowNew 签名对齐
- FlexionSDKHelper: prodPrice/prodCount 从参数直接写入 developerPayload
- playerId → userId 统一命名 (SDKTest/Java payload)
- pfId → pfid 统一小写 (服务端 JSON key)
- PaymentInfo 序列化替代 StringBuilder 手拼 JSON
- FlexionPaymentVerifier.Consume 走 UnityBridgeFunc.ConsumePurchase 桥接层
- UnityBridgeFunc 新增 ConsumePurchase 通用方法，移除渠道特定方法
- SDKManager.ConsumeFlexionPurchase → ConsumePurchase 通用化

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

sdk-intergration/Packages/tysdk/Runtime/UnityBridgeFunc.cs

@@ -47,6 +47,8 @@ namespace tysdk
 
         public static void Review() { }
 
+        public static void ConsumePurchase(string token) { }
+
         public static void FBShareLink(string title, string content, string url) { }
         public static void MessengerShareLink(string title, string content, string url) { }
 
@@ -168,6 +170,14 @@ namespace tysdk
             }
         }
 
+        public static void ConsumePurchase(string token)
+        {
+            using (var sdkManager = new AndroidJavaClass(SDK_CLASS))
+            {
+                sdkManager.CallStatic("ConsumePurchase", token);
+            }
+        }
+
         public static void UnityKnow(String productId, String productName, String productCount, String prodorderId, String appInfo)
         {
             using (var sdkManager = new AndroidJavaClass(SDK_CLASS))