feat: Android 4.2 兼容改造

- minSdk 19 -> 17（config.gradle）
- OkHttp 4.12 -> 3.12.0（app build.gradle 新老双栈统一锁定）
- Retrofit 2.11 -> 2.6.0 + Coroutines 1.8.1 -> 1.6.4
- SignRequestPolicy: toHttpUrlOrNull -> HttpUrl.parse（3.12 API 适配）
- HeaderInterceptor/SignAuthenticator: 属性访问改方法调用（url()/request()/priorResponse()）
- VideoViewTv: SDK_INT<19 强制切 AndroidMediaPlayer 内核 + instanceof 短路保护
- AndroidManifest: overrideLibrary OAID 4.1.3（minSdk 19）
- 全局 resolutionStrategy.force 锁定 OkHttp/Retrofit 版本

mediaplayertv/src/main/java/com/pukka/videoplayertv/VideoViewTv.java

@@ -328,6 +328,11 @@ public class VideoViewTv extends FrameLayout implements MediaPlayerControl {
     }
 
     private void initVideoView() {
+        // Android 4.2 兼容：ExoPlayer 2.19 官方支持 API 19+，低版本强制切系统 MediaPlayer 内核，
+        // 避免 PkExoMediaPlayer/ExoPlayer 类在 Dalvik 上触发 VerifyError
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
+            terminalType = 0;
+        }
         if (!checkAudioCapability()){
             terminalType = 0;
         }
@@ -562,7 +567,9 @@ public class VideoViewTv extends FrameLayout implements MediaPlayerControl {
                 reset();
                 mMediaPlayer.release();
                 if(mMediaPlayer != null){
-                    if(mMediaPlayer instanceof PkExoMediaPlayer){
+                    // terminalType 短路：非 Exo 内核时跳过 instanceof，避免 Dalvik 解析
+                    // PkExoMediaPlayer 引发的 ExoPlayer 类加载 VerifyError（Android 4.2）
+                    if(terminalType == 2 && mMediaPlayer instanceof PkExoMediaPlayer){
                         PkExoMediaPlayer pkExoMediaPlayer = (PkExoMediaPlayer)mMediaPlayer;
                         pkExoMediaPlayer.resetListeners();
                     }
@@ -1491,7 +1498,8 @@ public class VideoViewTv extends FrameLayout implements MediaPlayerControl {
         onPauseListener = null;
         onResumeListener = null;
         if(mMediaPlayer != null){
-            if(mMediaPlayer instanceof PkExoMediaPlayer){
+            // terminalType 短路：同上，避免非 Exo 内核时 Dalvik 触发 PkExoMediaPlayer 类解析
+            if(terminalType == 2 && mMediaPlayer instanceof PkExoMediaPlayer){
                 PkExoMediaPlayer pkExoMediaPlayer = (PkExoMediaPlayer)mMediaPlayer;
                 pkExoMediaPlayer.resetListeners();
             }