feat: Flexion 先验签后消费支付流程 + playerId 绑定

实现 Flexion 渠道支付验签重构：支付成功后不立即消费，将 purchaseJson/signature/purchaseToken
回调至 Unity，由服务端 SHA1withRSA 验签并校验 developerPayload.playerId 后再调用 consume。
同步更新 SDKManager 接口、UnityBridgeFunc 桥接、TYSdkModel 字段及 ExtraPluginCfgs。

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

sdk-intergration/Assets/Plugins/Android/mainTemplate.gradle

@@ -82,9 +82,7 @@ dependencies {
     implementation 'com.applovin.mediation:vungle-adapter:7.4.2.2' // Assets/MaxSdk/Mediation/Vungle/Editor/Dependencies.xml:4
     implementation 'com.applovin:applovin-sdk:13.5.1' // Assets/MaxSdk/AppLovin/Editor/Dependencies.xml:4
     implementation 'com.appsflyer:af-android-sdk:6.17.3' // Assets/AppsFlyer/Editor/AppsFlyerDependencies.xml:5
-    // Flexion: purchase-connector removed — Flexion does not use Google Play Billing.
-    // Also covered by top-level `configurations.all { exclude ... }` as a safety net.
-    // implementation 'com.appsflyer:purchase-connector:2.2.0' // Assets/AppsFlyer/Editor/AppsFlyerDependencies.xml:8
+    implementation 'com.appsflyer:purchase-connector:2.2.0' // Assets/AppsFlyer/Editor/AppsFlyerDependencies.xml:8
     implementation 'com.appsflyer:unity-wrapper:6.17.7' // Assets/AppsFlyer/Editor/AppsFlyerDependencies.xml:6
     implementation 'com.google.android.ump:user-messaging-platform:2.1.0' // Assets/MaxSdk/AppLovin/Editor/Dependencies.xml:5
 // Android Resolver Dependencies End