refactor(skill): 清理旧技能资源并更新攻击预制体

1.  删除废弃的技能图片、动画剪辑和旧的攻击预制体
2.  新增aw1/aw2/aw3/b3新攻击预制体
3.  调整现有攻击预制体的尺寸、缩放和精灵帧引用
4.  更新fb-2动画和预制体的配置

assets/resources/game/skill/atk/fb-2.prefab.meta

@@ -2,7 +2,7 @@
   "ver": "1.1.50",
   "importer": "prefab",
   "imported": true,
-  "uuid": "4dc0c920-bc0e-4124-885a-2f2738e41309",
+  "uuid": "645dfb6e-ad1c-4084-bbe8-ebd720c52af0",
   "files": [
     ".json"
   ],