feat(skill): 新增buff背景动画并调整箭矢技能资源

- 新增buff_bg.prefab及其动画资源，用于技能buff背景效果
- 新增arrow_big_yellow.prefab及其动画资源，添加黄色大箭矢技能
- 调整红、蓝、绿箭矢prefab的碰撞框尺寸（70×20→60×30）
- 为atk_s2.prefab添加spriteFrame并启用debugMode
- 更新SkillSet配置，调整基础技能对应的动画资源
- 优化atk02.anim和atk03.anim动画时长，移除冗余帧
- 重构箭矢动画文件结构，将atk_arrow_*重命名为arrow_*并更新引用
- 在ha1.prefab中集成buff_bg作为子节点

assets/resources/game/skill/anm/buff/buff_bg.anim

@@ -0,0 +1,110 @@
+[
+  {
+    "__type__": "cc.AnimationClip",
+    "_name": "buff_bg",
+    "_objFlags": 0,
+    "__editorExtras__": {
+      "embeddedPlayerGroups": []
+    },
+    "_native": "",
+    "sample": 20,
+    "speed": 1,
+    "wrapMode": 2,
+    "enableTrsBlending": false,
+    "_duration": 0.3,
+    "_hash": 500763545,
+    "_tracks": [
+      {
+        "__id__": 1
+      }
+    ],
+    "_exoticAnimation": null,
+    "_events": [],
+    "_embeddedPlayers": [],
+    "_additiveSettings": {
+      "__id__": 7
+    },
+    "_auxiliaryCurveEntries": []
+  },
+  {
+    "__type__": "cc.animation.ObjectTrack",
+    "_binding": {
+      "__type__": "cc.animation.TrackBinding",
+      "path": {
+        "__id__": 2
+      },
+      "proxy": null
+    },
+    "_channel": {
+      "__id__": 5
+    }
+  },
+  {
+    "__type__": "cc.animation.TrackPath",
+    "_paths": [
+      {
+        "__id__": 3
+      },
+      {
+        "__id__": 4
+      },
+      "spriteFrame"
+    ]
+  },
+  {
+    "__type__": "cc.animation.HierarchyPath",
+    "path": "skill"
+  },
+  {
+    "__type__": "cc.animation.ComponentPath",
+    "component": "cc.Sprite"
+  },
+  {
+    "__type__": "cc.animation.Channel",
+    "_curve": {
+      "__id__": 6
+    }
+  },
+  {
+    "__type__": "cc.ObjectCurve",
+    "_times": [
+      0,
+      0.05,
+      0.1,
+      0.15,
+      0.2,
+      0.25
+    ],
+    "_values": [
+      {
+        "__uuid__": "2423272e-e63b-4736-b15b-30b40cf98a23@35919",
+        "__expectedType__": "cc.SpriteFrame"
+      },
+      {
+        "__uuid__": "2423272e-e63b-4736-b15b-30b40cf98a23@28630",
+        "__expectedType__": "cc.SpriteFrame"
+      },
+      {
+        "__uuid__": "2423272e-e63b-4736-b15b-30b40cf98a23@d5f7a",
+        "__expectedType__": "cc.SpriteFrame"
+      },
+      {
+        "__uuid__": "2423272e-e63b-4736-b15b-30b40cf98a23@a426d",
+        "__expectedType__": "cc.SpriteFrame"
+      },
+      {
+        "__uuid__": "2423272e-e63b-4736-b15b-30b40cf98a23@d8ab8",
+        "__expectedType__": "cc.SpriteFrame"
+      },
+      {
+        "__uuid__": "2423272e-e63b-4736-b15b-30b40cf98a23@65c32",
+        "__expectedType__": "cc.SpriteFrame"
+      }
+    ]
+  },
+  {
+    "__type__": "cc.AnimationClipAdditiveSettings",
+    "enabled": false,
+    "refClip": null
+  }
+]

assets/resources/game/skill/anm/buff/buff_bg.anim.meta

@@ -0,0 +1,13 @@
+{
+  "ver": "2.0.3",
+  "importer": "animation-clip",
+  "imported": true,
+  "uuid": "a732ebac-b3c8-4f43-ac73-67a90a02ecfa",
+  "files": [
+    ".cconb"
+  ],
+  "subMetas": {},
+  "userData": {
+    "name": "buff_bg"
+  }
+}