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/Assets/Plugins/Android/settingsTemplate.gradle

@@ -16,17 +16,6 @@ dependencyResolutionManagement {
         **ARTIFACTORYREPOSITORY**
         google()
         mavenCentral()
-
-        // Flexion SDK Maven Repository
-        maven {
-            url = uri("https://maven.pkg.github.com/FlexionSDK/JavaSDK")
-            credentials {
-                username = "FlexionSDK"
-                // Replace with your actual Flexion PAT from DropPoint
-                password = "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"
-            }
-        }
-
 // Android Resolver Repos Start
         def unityProjectPath = $/file:///**DIR_UNITYPROJECT**/$.replace("\\", "/")
         maven {