refactor: FlexionSDKHelper 迁移至 ExtraPluginCfgs + 构建配置更新

- 删除 tysdk/Plugins/Android 下的 FlexionSDKHelper（已迁移至 ExtraPluginCfgs/flexion）
- 更新 AndroidManifest/mainTemplate.gradle/settingsTemplate.gradle 配置
- 更新 ChannelHelpers/ConfigManager 渠道配置
- 更新 tuyoosdk AAR 和 google-services.json

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

sdk-intergration/ProjectSettings/ProjectSettings.asset

@@ -163,7 +163,7 @@ PlayerSettings:
   androidSupportedAspectRatio: 1
   androidMaxAspectRatio: 2.1
   applicationIdentifier:
-    Android: com.arkgame.ft.flexion
+    Android: com.arkgame.ft
     Standalone: com.Unity-Technologies.com.unity.template.urp-blank
     iPhone: com.arkgame.ft
   buildNumber: