fix(push): 修复 UnvarnishedMessage.content -> message 编译错误

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sdk-push/src/main/java/com/xuqm/sdk/push/vivo/XuqmVivoPushReceiver.kt

@@ -21,7 +21,7 @@ class XuqmVivoPushReceiver : OpenClientPushMessageReceiver() {
     }
 
     override fun onTransmissionMessage(context: Context, message: UnvarnishedMessage) {
-        Log.d(TAG, "Vivo pass-through message received: ${message.content}")
+        Log.d(TAG, "Vivo pass-through message received: ${message.message}")
     }
 
     override fun onNotificationMessageClicked(context: Context, message: UPSNotificationMessage) {