fix(player): 隔离播放资源所有权并修复黑屏

lib/core/data/services/playback_neighbors.dart

@@ -15,6 +15,16 @@ class PlaybackCoordinator {
       if (!valid()) return false;
       if (_owner != session) {
         final previous = _owner;
+        if (previous != null && previous.owner != session.owner) {
+          if (kDebugMode) {
+            debugPrint(
+              '[player-owner] phase=reject-coordinator-handoff '
+              'owner=${session.owner.name} '
+              'activeOwner=${previous.owner.name}',
+            );
+          }
+          return false;
+        }
         await previous?._releasePlayers();
         if (previous != null && previous.livePlayerCount != 0) return false;
         _owner = null;
@@ -56,6 +66,10 @@ Future<void> _parkNeighbors(
 
 Future<void> _placeNeighbor(PlaybackSession session, _PlayerSlot? slot) async {
   if (slot == null || slot == session._active || slot.retiring) return;
+  if (slot.owner != session.owner) {
+    session._logOwnerRejection('park', slot);
+    return;
+  }
   if (session._next == null && slot.index == session._nextIndex) {
     session._next = slot;
     return;

lib/core/data/services/playback_session.dart

@@ -17,6 +17,8 @@ typedef PlayerFactory = PlayerPort Function(Episode episode);
 typedef PlayerPreparation =
     Future<void> Function(Episode episode, PlayerPort player);
 
+enum PlaybackSessionOwner { home, player }
+
 /// Owns current plus previous/next frames; allocation stays serialized.
 class PlaybackSession extends ChangeNotifier {
   PlaybackSession({
@@ -27,6 +29,8 @@ class PlaybackSession extends ChangeNotifier {
     this.activate,
     PlaybackCoordinator? coordinator,
     this.waitForFrame,
+    this.owner = PlaybackSessionOwner.player,
+    this.dramaIdAt,
   }) : _coordinator = coordinator ?? PlaybackCoordinator();
 
   final List<Episode> episodes;
@@ -39,6 +43,8 @@ class PlaybackSession extends ChangeNotifier {
   /// Runs only when a slot becomes current (e.g. progress listeners).
   final PlayerPreparation? activate;
   final Future<void> Function()? waitForFrame;
+  final PlaybackSessionOwner owner;
+  final String? Function(int index)? dramaIdAt;
   final PlaybackCoordinator _coordinator;
   final Set<_PlayerSlot> _live = {};
   _PlayerSlot? _active;
@@ -161,7 +167,12 @@ class PlaybackSession extends ChangeNotifier {
     if (_live.length >= maxLivePlayers) {
       throw StateError('Playback resource limit reached');
     }
-    final slot = _PlayerSlot(index, factory(episodes[index]));
+    final slot = _PlayerSlot(
+      index,
+      factory(episodes[index]),
+      owner: owner,
+      dramaId: dramaIdAt?.call(index),
+    );
     _live.add(slot);
     slot.ready = () async {
       try {
@@ -180,7 +191,19 @@ class PlaybackSession extends ChangeNotifier {
   }
 
   Future<void> _retire(_PlayerSlot? slot) async {
-    if (slot == null || !_live.contains(slot)) return;
+    if (slot == null) return;
+    if (slot.owner != owner) {
+      _logOwnerRejection('retire', slot);
+      return;
+    }
+    if (!_live.contains(slot)) return;
+    if (kDebugMode) {
+      debugPrint(
+        '[player-owner] phase=retire owner=${slot.owner.name} '
+        'drama=${slot.dramaId ?? '-'} episodeIndex=${slot.index} '
+        'controller=${_playerIdentity(slot.player)}',
+      );
+    }
     slot.retiring = true;
     final cleared =
         _active == slot ||
@@ -460,6 +483,15 @@ class PlaybackSession extends ChangeNotifier {
     if (!_closed) notifyListeners();
   }
 
+  void _logOwnerRejection(String phase, _PlayerSlot slot) {
+    if (!kDebugMode) return;
+    debugPrint(
+      '[player-owner] phase=reject-$phase expected=${owner.name} '
+      'actual=${slot.owner.name} drama=${slot.dramaId ?? '-'} '
+      'episodeIndex=${slot.index} controller=${_playerIdentity(slot.player)}',
+    );
+  }
+
   Future<void> close() async {
     if (_closed) return;
     _closed = true;
@@ -470,9 +502,16 @@ class PlaybackSession extends ChangeNotifier {
 }
 
 class _PlayerSlot {
-  _PlayerSlot(this.index, this.player);
+  _PlayerSlot(
+    this.index,
+    this.player, {
+    required this.owner,
+    required this.dramaId,
+  });
   int index;
   final PlayerPort player;
+  final PlaybackSessionOwner owner;
+  final String? dramaId;
   late final Future<void> ready;
   bool prepared = false;
   bool activated = false;
@@ -481,3 +520,9 @@ class _PlayerSlot {
   bool reusedWarm = false;
   Object? failure;
 }
+
+String _playerIdentity(PlayerPort player) {
+  return player is VideoPlayerPort
+      ? '${identityHashCode(player.controller)}'
+      : '${identityHashCode(player)}';
+}