feat(角色): 添加新角色资源及调整现有角色属性

新增狗、猫、鸡、MTY等角色的图片和动画资源，并调整部分角色的属性和动画逻辑。包括：
- 添加狗角色的行走动画和图片资源
- 更新猫角色的行走动画和碰撞体
- 调整鸡角色的属性和动画帧
- 修改MTY角色的攻击冷却时间
- 更新彩虹糖的数值属性
- 优化链式机枪的攻击力属性
- 添加企鹅角色的多帧动画资源
- 更新熊角色的行走动画和面具资源

同时修复了部分角色的碰撞体大小和位置问题。

resources/characters/dog/dog2-a.png.import

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+[deps]
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+source_file="res://resources/characters/dog/dog2-a.png"
+dest_files=["res://.godot/imported/dog2-a.png-1e212eb83cbf6562f6fa8cb7cd4152cf.ctex"]
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+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
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+process/size_limit=0
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resources/characters/dog/dog2-b.png.import

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+[remap]
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+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bl55w8y7uyy1d"
+path="res://.godot/imported/dog2-b.png-06d0b16ea5c278e489ec87d3309393d7.ctex"
+metadata={
+"vram_texture": false
+}
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+[deps]
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+source_file="res://resources/characters/dog/dog2-b.png"
+dest_files=["res://.godot/imported/dog2-b.png-06d0b16ea5c278e489ec87d3309393d7.ctex"]
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+[params]
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+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
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+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