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/mo3.prefab

@@ -249,10 +249,6 @@
         "__uuid__": "4949e728-0192-4f1d-a0b5-dacf3f3270aa",
         "__expectedType__": "cc.AnimationClip"
       },
-      {
-        "__uuid__": "96db8ed3-5089-46f2-aa64-8da04ac5e0ff",
-        "__expectedType__": "cc.AnimationClip"
-      },
       {
         "__uuid__": "9697b6a9-775b-473a-a697-9ae509b28fac",
         "__expectedType__": "cc.AnimationClip"
@@ -754,6 +750,7 @@
     },
     "fileId": "fdklpBwCBM/qJ4WFlQF3kT",
     "instance": null,
+    "targetOverrides": null,
     "nestedPrefabInstanceRoots": [
       {
         "__id__": 26