feat(角色): 为赛博猫猫和深海添加掉落物品配置

feat(武器): 新增引力源武器及其资源文件
- 添加引力源武器的场景配置和SVG资源
- 包含引力源武器的物理效果和描述文本

fix(子弹): 调整紫色小水晶的穿透属性
- 将穿透值设为0.25
- 更新链式机枪的描述以反映穿透属性变化

refactor(角色): 移除公鸡角色的武器存储
- 删除公鸡角色中不再需要的武器实例

chore(关卡): 更新调试关卡配置
- 将waveDebugConfig改为使用WAVE_MOWING

resources/weapons/gravity-source.svg

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resources/weapons/gravity-source.svg.import

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