基线备份：thirdparty 变体完成 + Android 4.2 兼容改造前

包含内容：
- thirdparty flavor 独立 applicationId + Intent 入口（ThirdPartyEntryActivity）
- 58 后端接口适配（单 /api 路径、code 0/200、camelCase 字段、UNBOUND 轮询）
- MAC 硬件锚定校验（防一凭证多设备共用）
- EPG mac 覆盖 SDK init（sMacOverride）+ ChannelManger 初始化对齐
- 提示文案优化（设备未注册/权益未绑定）

app/src/main/java/com/pukka/jiecheng/downapk/UpgradeHelper.java

@@ -0,0 +1,39 @@
+package com.pukka.jiecheng.downapk;
+
+import android.app.Activity;
+
+public class UpgradeHelper {
+    private static final String TAG = "UpgradeHelper";
+
+    private UpgradeHelper() {
+    }
+
+    public static void upgrade(Activity activity, String versionCode, String versionName, String downloadUrl, boolean isForce) {
+        upgrade(activity, versionCode, versionName, downloadUrl, isForce, null);
+    }
+
+    public static void upgrade(Activity activity, String versionCode, String versionName, String downloadUrl, boolean isForce, DownApkDialog.OnSkipUpgradeListener onSkipUpgradeListener) {
+        if (activity == null || activity.isFinishing()) {
+            return;
+        }
+        if (downloadUrl == null || downloadUrl.isEmpty()) {
+            return;
+        }
+        DownApkDialog dialog = new DownApkDialog(activity);
+        dialog.setUpgradeInfo(versionCode, versionName, downloadUrl, isForce);
+        dialog.setOnSkipUpgradeListener(onSkipUpgradeListener);
+        dialog.showUpgradeDialog();
+    }
+
+    public static void upgrade(Activity activity, String versionCode, String downloadUrl, boolean isForce) {
+        upgrade(activity, versionCode, "", downloadUrl, isForce);
+    }
+
+    public static void upgradeForce(Activity activity, String versionCode, String versionName, String downloadUrl) {
+        upgrade(activity, versionCode, versionName, downloadUrl, true);
+    }
+
+    public static void upgradeOptional(Activity activity, String versionCode, String versionName, String downloadUrl) {
+        upgrade(activity, versionCode, versionName, downloadUrl, false);
+    }
+}