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.import

@@ -0,0 +1,43 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dbbd5ljkfvof8"
+path="res://.godot/imported/gravity-source.svg-4080192372fa7c00781334c13cd9a26a.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://resources/weapons/gravity-source.svg"
+dest_files=["res://.godot/imported/gravity-source.svg-4080192372fa7c00781334c13cd9a26a.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false