feat: merge rustore test UI and unify SKU format across channels

- Merge VK login/link/check and Review test buttons from dev_rustore
- Unify Rustore/GooglePlay SKU format via ChannelHelpers.normalizeSkuList()
- Fix ChannelConfig runtime sync: Java InitSDK sets channel from ChannelHelpers.CHANNEL
- Fix AndroidMinSdkVersion 25→26 for tuyoosdk compatibility
- Fix Flexion AndroidManifest tools:replace missing fullBackupContent value
- Add [CHANNEL-VERIFY] debug logs for channel verification

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

sdk-intergration/Packages/tysdk/Plugins/Android/ChannelHelpers.java

@@ -6,4 +6,8 @@ public class ChannelHelpers {
     static void register() {
         // GooglePlay uses default behavior, no additional SDKHelper
     }
+
+    public static String normalizeSkuList(String msg) {
+        return msg;
+    }
 }

sdk-intergration/Packages/tysdk/Plugins/Android/SDKManager.java

@@ -77,13 +77,16 @@ public class SDKManager {
     // -------------------------------------------------------------------------
 
     public static void InitSDK(Activity activity, String ch) {
-        channel = ch != null ? ch : "GooglePlay";
+        channel = ChannelHelpers.CHANNEL;
         ChannelHelpers.register();
-        if (!channel.equals(ChannelHelpers.CHANNEL)) {
-            Log.e(TAG, "Channel mismatch! Helpers=" + ChannelHelpers.CHANNEL + " expected=" + channel);
-        }
         sdkHelper = helperMap.get(channel);
-        Log.i(TAG, "InitSDK channel=" + channel + " helper=" + (sdkHelper != null ? sdkHelper.getClass().getSimpleName() : "none"));
+        Log.i(TAG, "[CHANNEL-VERIFY] Java InitSDK channel=" + channel
+                + " fromCSharp=" + ch
+                + " helper=" + (sdkHelper != null ? sdkHelper.getClass().getSimpleName() : "default"));
+
+        // Sync channel to C# ChannelConfig
+        UnityPlayer.UnitySendMessage(ConfigManager.UNITY_FACADE_NAME,
+                "SetChannelFromNative", channel);
 
         if (sdkHelper != null) {
             sdkHelper.init(activity);
@@ -422,7 +425,7 @@ public class SDKManager {
                     JSONObject result = new JSONObject();
                     result.put("code", code);
                     if (code == SDKCallBack.Extend.EXTEND_CODE_SUCCESS) {
-                        result.put("respObj", msg);
+                        result.put("respObj", ChannelHelpers.normalizeSkuList(msg));
                     } else {
                         Log.e(TAG, "thirdExtend failed: " + msg);
                         result.put("thirdExtend_errStr", msg);

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

@@ -138,6 +138,13 @@ namespace tysdk
 #endif
         }
 
+        // Called from Java SDKManager.InitSDK to sync channel
+        public void SetChannelFromNative(string ch)
+        {
+            ChannelConfig.SetChannel(ch);
+            UnityEngine.Debug.Log($"[CHANNEL-VERIFY] C# SetChannelFromNative → channel={ch}, payType={ChannelConfig.PayType}, loginTimeout={ChannelConfig.LoginTimeoutSeconds}");
+        }
+
         /*================================================
                                  _                             _
                                 / \   ___ ___ ___  _   _ _ __ | |_

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

@@ -94,17 +94,11 @@ namespace tysdk
         public string price_currency_code;
         public string title;
         public string type;
-
-        // RuStore specific
         public string currency;
         public string price_amount;
 
-        public string ProdPriceStr => ChannelConfig.Channel == "Rustore"
-            ? $"₽{ProdPrice}"
-            : price;
-        public float ProdPrice => ChannelConfig.Channel == "Rustore"
-            ? float.Parse(price) / 100
-            : float.Parse(price_amount_micros) / 1000000;
+        public string ProdPriceStr => price;
+        public float ProdPrice => float.Parse(price_amount_micros) / 1000000;
         public string ProdID => ourProductId;
         public string ProdKey => productId;
 

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

@@ -66,6 +66,7 @@ namespace tysdk
                 using (var activityCls = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
                 {
                     var activity = activityCls.GetStatic<AndroidJavaObject>("currentActivity");
+                    UnityEngine.Debug.Log("[CHANNEL-VERIFY] C# InitSDK → ChannelConfig.Channel=" + ChannelConfig.Channel);
                     sdkManager.CallStatic("InitSDK", activity, ChannelConfig.Channel);
                 }
             }