chore(skill assets): clean up unused skill related prefab and animation files

本次提交清理了大量未使用的技能相关预制件和动画资源文件，包括多个失效的prefab、anim及其meta元文件，同时优化了dead.prefab和yellow.anim的配置参数，移除冗余无用的资源代码。

assets/resources/game/skill/end/dead.prefab

@@ -29,18 +29,15 @@
       },
       {
         "__id__": 10
-      },
-      {
-        "__id__": 12
       }
     ],
     "_prefab": {
-      "__id__": 14
+      "__id__": 12
     },
     "_lpos": {
       "__type__": "cc.Vec3",
-      "x": 6.112,
-      "y": 45.573,
+      "x": 0,
+      "y": 0,
       "z": 0
     },
     "_lrot": {
@@ -68,7 +65,7 @@
   },
   {
     "__type__": "cc.Node",
-    "_name": "Node",
+    "_name": "skill",
     "_objFlags": 0,
     "__editorExtras__": {},
     "_parent": {
@@ -90,7 +87,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 30,
+      "y": -60,
       "z": 0
     },
     "_lrot": {
@@ -102,8 +99,8 @@
     },
     "_lscale": {
       "__type__": "cc.Vec3",
-      "x": 0.65,
-      "y": 0.65,
+      "x": 1,
+      "y": 1,
       "z": 1
     },
     "_mobility": 0,
@@ -130,19 +127,19 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 127,
-      "height": 127
+      "width": 228,
+      "height": 207
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
       "x": 0.5,
-      "y": 0.5
+      "y": 0
     },
     "_id": ""
   },
   {
     "__type__": "cc.CompPrefabInfo",
-    "fileId": "ddhDbko4FLmKZGY46brX7z"
+    "fileId": "b4sNQPJWFKha7x75SWXmRj"
   },
   {
     "__type__": "cc.Sprite",
@@ -166,25 +163,31 @@
       "b": 255,
       "a": 255
     },
-    "_spriteFrame": null,
-    "_type": 0,
-    "_fillType": 0,
+    "_spriteFrame": {
+      "__uuid__": "2423272e-e63b-4736-b15b-30b40cf98a23@a16b8",
+      "__expectedType__": "cc.SpriteFrame"
+    },
+    "_type": 1,
+    "_fillType": 1,
     "_sizeMode": 1,
     "_fillCenter": {
       "__type__": "cc.Vec2",
       "x": 0,
       "y": 0
     },
-    "_fillStart": 0,
-    "_fillRange": 0,
+    "_fillStart": 0.2,
+    "_fillRange": 1,
     "_isTrimmedMode": true,
-    "_useGrayscale": false,
-    "_atlas": null,
+    "_useGrayscale": true,
+    "_atlas": {
+      "__uuid__": "2423272e-e63b-4736-b15b-30b40cf98a23",
+      "__expectedType__": "cc.SpriteAtlas"
+    },
     "_id": ""
   },
   {
     "__type__": "cc.CompPrefabInfo",
-    "fileId": "c3vPZUzCRINL3sICnCZKIr"
+    "fileId": "9a+65VIghBm4HQxuHPQ/mg"
   },
   {
     "__type__": "cc.PrefabInfo",
@@ -194,7 +197,7 @@
     "asset": {
       "__id__": 0
     },
-    "fileId": "feOW1uSctLKYCw3esMiuox",
+    "fileId": "7a5LvbdlxEc6FKa7cun2oB",
     "instance": null,
     "targetOverrides": null,
     "nestedPrefabInstanceRoots": null
@@ -213,19 +216,19 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 104,
-      "height": 75
+      "width": 80,
+      "height": 110
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
       "x": 0.5,
-      "y": 0.5
+      "y": 0
     },
     "_id": ""
   },
   {
     "__type__": "cc.CompPrefabInfo",
-    "fileId": "a7pn5tzA1BSI1AfdpVsHh7"
+    "fileId": "63NP9yq3hEUKD/OZZZ5t7x"
   },
   {
     "__type__": "cc.Animation",
@@ -242,37 +245,19 @@
     "playOnLoad": true,
     "_clips": [
       {
-        "__uuid__": "f6fa875d-2465-4e3b-8f4d-52d2ee43481d",
+        "__uuid__": "11f930a0-c09e-48e3-9616-c209909363a2",
         "__expectedType__": "cc.AnimationClip"
       }
     ],
     "_defaultClip": {
-      "__uuid__": "f6fa875d-2465-4e3b-8f4d-52d2ee43481d",
+      "__uuid__": "11f930a0-c09e-48e3-9616-c209909363a2",
       "__expectedType__": "cc.AnimationClip"
     },
     "_id": ""
   },
   {
     "__type__": "cc.CompPrefabInfo",
-    "fileId": "63z5ZyjTNKYbn+kEVB1s3W"
-  },
-  {
-    "__type__": "0f3c4JhFbFO2rEFqBJJ7hFv",
-    "_name": "",
-    "_objFlags": 0,
-    "__editorExtras__": {},
-    "node": {
-      "__id__": 1
-    },
-    "_enabled": true,
-    "__prefab": {
-      "__id__": 13
-    },
-    "_id": ""
-  },
-  {
-    "__type__": "cc.CompPrefabInfo",
-    "fileId": "32SLcINL1JHZ+vIyextzaC"
+    "fileId": "c6LOemuvJKyYCqlF/yUJcr"
   },
   {
     "__type__": "cc.PrefabInfo",
@@ -282,7 +267,7 @@
     "asset": {
       "__id__": 0
     },
-    "fileId": "cfqCWnxbFLNoQMedQXsav3",
+    "fileId": "c46/YsCPVOJYA4mWEpNYRx",
     "instance": null,
     "targetOverrides": null
   }