feat: 添加下载内存管理系统 #75
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feat: 添加下载内存管理系统 #75
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新增功能： - 实现 LRU 缓存清理管理器（downloadCleanupManager） - 防止批量下载大量歌曲时内存溢出 - 保留最近 16 项下载，超过自动清理最旧的 改动列表： - ncmExtend/src/utils/downloadCleanupManager.js (新建) - ncmExtend/src/components/batchDownloadSongs.js (集成清理回调) - ncmExtend/src/playlist/playlistDetail.js (修复导入路径) - ncmExtend/publish/ncmExtend.user.js (编译输出) 清理策略： ✓ 下载过程中：超过 16 项时清理最旧的（防止内存无限增长） ✓ 下载完成时：保留缓存（避免写入失败） ✓ 页面刷新后：自动清除（随页面生命周期）
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功能描述
解决批量下载大量歌曲（1000+）时出现的内存泄漏问题。实现了一个轻量级的 LRU（最近最少使用）缓存清理系统，防止长时间下载导致的内存无限增长。
问题背景
解决方案
1. 新增内存管理模块
src/utils/downloadCleanupManager.js2. 集成到批量下载流程
src/components/batchDownloadSongs.jsaddPendingCleanup()3. 修复导入路径
src/playlist/playlistDetail.jsSongsDownUpLoad→songsDownUpLoad（Linux 大小写敏感）清理策略详解
下载过程中 (1-16 项) 下载过程中 (>16 项) 下载完成
保留全部缓存 → LRU 自动清理 → 保留缓存
↓
用户刷新页面后清除
测试结果
✅ 支持一次性下载 1000+ 首歌曲
✅ 内存占用保持在可控水平（最多 16 个文件的缓存）
✅ 下载稳定性不受影响
✅ 用户无需手动清理，刷新后自动清除