feat(player): 改进玩家动画系统，支持四方向动画

- 添加新的动画文件支持上下左右四个方向的站立和行走动画
- 重构PlayerDirection枚举，支持左上、左下、右上、右下四个象限
- 优化动画切换逻辑，增加动画候选机制和兜底策略
- 改进方向判断算法，基于移动增量精确计算朝向
- 移除BonusWuqi相关资源和节点引用
- 更新场景文件，添加新动画剪辑引用

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