chore: 移除英雄死亡动画资源以清理无用资产

删除多个英雄（ha1, ha2, ha3, hc1, hh1, hk1-hk4, hm1-hm9等）的dead.anim和dead.anim.meta文件，并从对应的prefab文件中移除对这些动画资源的引用。这些死亡动画未被使用，清理以减少项目体积和维护负担。

assets/resources/game/heros/hero/0/dead.anim

@@ -1,71 +0,0 @@
-[
-  {
-    "__type__": "cc.AnimationClip",
-    "_name": "dead",
-    "_objFlags": 0,
-    "__editorExtras__": {
-      "embeddedPlayerGroups": []
-    },
-    "_native": "",
-    "sample": 30,
-    "speed": 1,
-    "wrapMode": 1,
-    "enableTrsBlending": false,
-    "_duration": 0,
-    "_hash": 500763545,
-    "_tracks": [
-      {
-        "__id__": 1
-      }
-    ],
-    "_exoticAnimation": null,
-    "_events": [],
-    "_embeddedPlayers": [],
-    "_additiveSettings": {
-      "__id__": 6
-    },
-    "_auxiliaryCurveEntries": []
-  },
-  {
-    "__type__": "cc.animation.ObjectTrack",
-    "_binding": {
-      "__type__": "cc.animation.TrackBinding",
-      "path": {
-        "__id__": 2
-      },
-      "proxy": null
-    },
-    "_channel": {
-      "__id__": 4
-    }
-  },
-  {
-    "__type__": "cc.animation.TrackPath",
-    "_paths": [
-      {
-        "__id__": 3
-      },
-      "spriteFrame"
-    ]
-  },
-  {
-    "__type__": "cc.animation.ComponentPath",
-    "component": "cc.Sprite"
-  },
-  {
-    "__type__": "cc.animation.Channel",
-    "_curve": {
-      "__id__": 5
-    }
-  },
-  {
-    "__type__": "cc.ObjectCurve",
-    "_times": [],
-    "_values": []
-  },
-  {
-    "__type__": "cc.AnimationClipAdditiveSettings",
-    "enabled": false,
-    "refClip": null
-  }
-]

assets/resources/game/heros/hero/0/dead.anim.meta

@@ -1,13 +0,0 @@
-{
-  "ver": "2.0.3",
-  "importer": "animation-clip",
-  "imported": true,
-  "uuid": "1acca320-e159-4c4c-aa73-fd8987b590d6",
-  "files": [
-    ".cconb"
-  ],
-  "subMetas": {},
-  "userData": {
-    "name": "dead"
-  }
-}