feat(skill): 新增死亡动画及预制体资源

添加 dead.prefab 预制体及其关联的 dead.anim 动画文件，用于角色死亡时的技能表现。

assets/resources/game/skill/anm/atked/dead.anim

@@ -0,0 +1,78 @@
+[
+  {
+    "__type__": "cc.AnimationClip",
+    "_name": "dead",
+    "_objFlags": 0,
+    "__editorExtras__": {
+      "embeddedPlayerGroups": []
+    },
+    "_native": "",
+    "sample": 60,
+    "speed": 1,
+    "wrapMode": 1,
+    "enableTrsBlending": false,
+    "_duration": 0,
+    "_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": "Node"
+  },
+  {
+    "__type__": "cc.animation.ComponentPath",
+    "component": "cc.Sprite"
+  },
+  {
+    "__type__": "cc.animation.Channel",
+    "_curve": {
+      "__id__": 6
+    }
+  },
+  {
+    "__type__": "cc.ObjectCurve",
+    "_times": [],
+    "_values": []
+  },
+  {
+    "__type__": "cc.AnimationClipAdditiveSettings",
+    "enabled": false,
+    "refClip": null
+  }
+]

assets/resources/game/skill/anm/atked/dead.anim.meta

@@ -0,0 +1,13 @@
+{
+  "ver": "2.0.3",
+  "importer": "animation-clip",
+  "imported": true,
+  "uuid": "f6fa875d-2465-4e3b-8f4d-52d2ee43481d",
+  "files": [
+    ".cconb"
+  ],
+  "subMetas": {},
+  "userData": {
+    "name": "dead"
+  }
+}