feat(assets): 添加新英雄资源并调整动画参数

- 新增 hm6、hm7、hm8、hm9 英雄的目录结构、动画资源和预制体
- 为所有英雄统一调整缩放比例至更合理的数值
- 优化多个英雄的攻击、死亡和最大技能动画的帧率和时长
- 调整 shielded 护盾效果的缩放比例
- 修复部分动画名称错误（如 atk2 改为 dead）
- 新增英雄 0 的预制体资源

assets/resources/game/heros/hero/hm5/atk0.anim

@@ -1,13 +1,13 @@
 [
   {
     "__type__": "cc.AnimationClip",
-    "_name": "atk",
+    "_name": "atk0",
     "_objFlags": 0,
     "__editorExtras__": {
       "embeddedPlayerGroups": []
     },
     "_native": "",
-    "sample": 15,
+    "sample": 30,
     "speed": 1,
     "wrapMode": 1,
     "enableTrsBlending": false,

assets/resources/game/heros/hero/hm5/dead.anim

@@ -1,13 +1,13 @@
 [
   {
     "__type__": "cc.AnimationClip",
-    "_name": "atk2",
+    "_name": "dead",
     "_objFlags": 0,
     "__editorExtras__": {
       "embeddedPlayerGroups": []
     },
     "_native": "",
-    "sample": 15,
+    "sample": 30,
     "speed": 1,
     "wrapMode": 1,
     "enableTrsBlending": false,

assets/resources/game/heros/hero/hm5/max0.anim

@@ -1,13 +1,13 @@
 [
   {
     "__type__": "cc.AnimationClip",
-    "_name": "max",
+    "_name": "max0",
     "_objFlags": 0,
     "__editorExtras__": {
       "embeddedPlayerGroups": []
     },
     "_native": "",
-    "sample": 15,
+    "sample": 20,
     "speed": 1,
     "wrapMode": 1,
     "enableTrsBlending": false,

assets/resources/game/heros/hero/hm5/max1.anim

@@ -7,7 +7,7 @@
       "embeddedPlayerGroups": []
     },
     "_native": "",
-    "sample": 15,
+    "sample": 30,
     "speed": 1,
     "wrapMode": 1,
     "enableTrsBlending": false,