feat(武器): 添加彩虹猫之刃武器及相关资源

添加彩虹猫之刃武器，包含以下内容：
- 新增彩虹猫子弹和武器贴图资源
- 实现彩虹猫子弹和武器逻辑脚本
- 添加武器预制体和相关动画效果
- 在公鸡角色中默认装备该武器
- 修改子弹基类添加AI调用逻辑

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