fix(player): 收紧图片与快速切集资源占用

lib/pages/player/player_logic.dart

@@ -93,6 +93,9 @@ class PlayerLogic extends ChangeNotifier {
   String selectedQuality = 'AUTO';
   Duration? _qualitySeek;
   int pageRequest = 0;
+  int? _pendingSelectionIndex;
+  int? _pendingSelectionRevision;
+  Future<void>? _selectionDrain;
   bool muted = false;
   double playbackSpeed = 1.0;
   bool stoppedAtFeedEnd = false;
@@ -957,6 +960,37 @@ class PlayerLogic extends ChangeNotifier {
     );
   }
 
+  /// 翻页入口使用 single-flight：执行中的切集不被重复排队，只保留最新目标。
+  Future<void> requestEpisodeSelection(int index, {int? revision}) {
+    if (_disposed || index < 0 || index >= sessionEpisodes.length) {
+      return Future<void>.value();
+    }
+    _pendingSelectionIndex = index;
+    _pendingSelectionRevision = revision;
+    return _selectionDrain ??= _drainEpisodeSelections();
+  }
+
+  Future<void> _drainEpisodeSelections() async {
+    try {
+      while (!_disposed) {
+        final index = _pendingSelectionIndex;
+        if (index == null) break;
+        final revision = _pendingSelectionRevision;
+        _pendingSelectionIndex = null;
+        _pendingSelectionRevision = null;
+        await selectEpisode(index, revision: revision);
+      }
+    } finally {
+      _selectionDrain = null;
+      final index = _pendingSelectionIndex;
+      if (!_disposed && index != null) {
+        unawaited(
+          requestEpisodeSelection(index, revision: _pendingSelectionRevision),
+        );
+      }
+    }
+  }
+
   Future<void> selectEpisode(int index, {int? revision}) async {
     final feedRevisionAtStart = revision ?? feedRevision;
     final request = ++pageRequest;

lib/pages/player/player_view.dart

@@ -353,6 +353,28 @@ class _PlayerPageState extends State<PlayerPage>
     );
   }
 
+  Future<void> _selectPage(int index) async {
+    await logic.requestEpisodeSelection(index);
+    if (!mounted || logic.session.currentIndex != index) return;
+    await logic.session.preloadSettled;
+    if (!mounted || logic.session.currentIndex != index) return;
+    _logResourceWatermark();
+  }
+
+  void _logResourceWatermark() {
+    if (!kDebugMode) return;
+    final imageCache = PaintingBinding.instance.imageCache;
+    debugPrint(
+      '[player-resources] '
+      'slots=${logic.session.livePlayerCount} '
+      'warmNext=${logic.session.preloadedIndex ?? '-'} '
+      'warmPrevious=${logic.session.previousPreloadedIndex ?? '-'} '
+      'sprites=${_spriteAxisService.spriteCacheSize} '
+      'imageCacheBytes=${imageCache.currentSizeBytes} '
+      'imageCacheCount=${imageCache.currentSize}',
+    );
+  }
+
   void _setScrubbing(bool value) {
     if (!mounted) return;
     if (_scrubbing == value) return;
@@ -507,7 +529,7 @@ class _PlayerPageState extends State<PlayerPage>
             onPageChanged: (position) {
               final index = indices[position];
               widget.onDramaChanged?.call(logic.queue.entryAt(index).drama);
-              unawaited(logic.selectEpisode(index));
+              unawaited(_selectPage(index));
               if (position >= indices.length - 3) {
                 final loadMore = widget.onLoadMore;
                 if (loadMore != null) unawaited(loadMore());

lib/pages/player/widgets/player_opening_frame.dart

@@ -7,6 +7,7 @@ import 'package:flutter/material.dart';
 import '../../../core/config/app_config.dart';
 import '../../../core/data/services/sprite_thumbnail_axis.dart';
 import '../../../core/theme/app_colors.dart';
+import '../../../core/widgets/remote_image.dart';
 import 'scrub_preview_card.dart';
 
 enum PlayerOpeningFallback { handoff, poster, thumbnails, black }
@@ -149,12 +150,25 @@ class _PlayerOpeningFrameState extends State<PlayerOpeningFrame> {
     children: [
       const ColoredBox(color: AppColors.mediaBlack),
       if (_hasPoster)
-        Image.network(
-          AppConfig.mediaUrl(widget.posterUrl!.trim()),
-          key: const Key('player-opening-poster'),
-          fit: widget.fit,
-          gaplessPlayback: true,
-          errorBuilder: (_, _, _) => _handlePosterError(),
+        LayoutBuilder(
+          builder: (context, constraints) {
+            final pixelRatio = MediaQuery.devicePixelRatioOf(context);
+            return Image.network(
+              AppConfig.mediaUrl(widget.posterUrl!.trim()),
+              key: const Key('player-opening-poster'),
+              fit: widget.fit,
+              cacheWidth: resolveImageDecodePixels(
+                constraints.maxWidth,
+                pixelRatio,
+              ),
+              cacheHeight: resolveImageDecodePixels(
+                constraints.maxHeight,
+                pixelRatio,
+              ),
+              gaplessPlayback: true,
+              errorBuilder: (_, _, _) => _handlePosterError(),
+            );
+          },
         )
       else
         _spriteOrBlack(),