[+]为LoadLocalImages增添了区域图片的直读

[HawkingLaughing]

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[gemini-code-assist]

Summary of Changes

Hello @HawkingLaughing, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此 PR 旨在增强 LoadLocalImages 模块的功能，使其能够直接加载和管理本地的区域地图背景图片。通过引入新的字典扩展方法、专门的地图背景路径存储以及相应的图片处理和转换方法，该改动使得游戏能够更灵活地使用自定义地图背景资源。此外，通过对 AssetManager 的打补丁，确保了这些本地资源能够无缝地集成到游戏资产加载流程中。

Highlights

• 新的扩展方法: 为嵌套字典 Dictionary<TKey1, Dictionary<TKey2, TValue>> 添加了 GetExValueOrDefault 扩展方法，以简化对多层字典值的安全访问。
• 地图背景图片加载: 新增了对本地地图背景图片（mapBgPaths）的直接读取支持，允许从指定目录加载自定义地图背景资源。
• 地图背景处理方法: 实现了 GetMapBgPath、GetMapBgTexture2D 和 GetMapBgSprite 方法，用于检索地图背景图片的路径，并将其转换为 Texture2D 和 Sprite 对象。
• AssetManager 补丁: 引入了一个 Harmony 补丁 MapLoader，拦截 AssetManager.GetMapBgSprite 方法，使其能够优先加载本地提供的地图背景精灵，从而实现自定义地图背景功能。

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[gemini-code-assist]

Code Review

这个PR为LoadLocalImages添加了直接读取区域图片的功能，并通过Harmony Patch拦截了游戏原有的图片加载方法。代码改动清晰地实现了目标功能。我发现了一些可以改进的地方：

• 文件路径的拼接方式存在风险，建议使用更安全的方法。
• 部分代码中存在冗余的逻辑，可以简化以提高代码清晰度。
• 循环中的日志记录可能会产生性能问题。

具体的修改建议请见下方评论。

[gemini-code-assist]

这里的空值合并运算符 ?? 是多余的。因为在上一行 if(sprite == null) return true; 已经处理了 sprite 为 null 的情况。执行到这一行时，sprite 必然不为 null，因此 ?? 后面的部分永远不会被执行。这会使代码逻辑变得混乱。

            __result = sprite;

[HawkingLaughing]

不确定，我跟着之前有的内容写的

[HawkingLaughing]

该处内容已更新

[HawkingLaughing]

请无视此文件的修改