• Improved map-cache performance by keeping normal map loading responsive while cache cleanup and space recovery run in the background.
• Improved cache-index updates and cleanup reliability, reducing unnecessary disk activity and avoiding conflicts with active cache files.

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• 优化地图缓存性能：缓存清理和空间回收在后台进行时，正常地图加载仍可保持响应。
• 改进缓存索引更新和清理可靠性，减少不必要的磁盘操作，并避免与正在使用的缓存文件发生冲突。