scene：创建广场地图场景并添加环境瓦片资源

- 新增square.tscn广场地图场景
- 添加多种环境瓦片纹理资源
- 包含草地、地板、路缘等瓦片素材

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assets/sprites/environment/download_1767426187137.png.import

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assets/sprites/environment/广场瓦片集.png.import

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assets/sprites/environment/草地.png.import

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scenes/Maps/square.tscn

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