fix(player): 收紧图片与快速切集资源占用

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(),