feat: 新增水球技能并调整英雄技能配置

- 新增水球技能资源文件、动画及配置项
- 调整盾战士、圣骑士、牧师等英雄的技能触发条件
- 更新技能说明文档，补充攻击类型和特殊效果描述
- 微调技能准备动画的垂直位置
- 为护盾buff动画添加新的精灵帧序列

assets/resources/game/skill/buff/shielded.prefab

@@ -20,19 +20,22 @@
     "_children": [
       {
         "__id__": 2
+      },
+      {
+        "__id__": 8
       }
     ],
     "_active": true,
     "_components": [
       {
-        "__id__": 8
+        "__id__": 14
       },
       {
-        "__id__": 10
+        "__id__": 16
       }
     ],
     "_prefab": {
-      "__id__": 12
+      "__id__": 18
     },
     "_lpos": {
       "__type__": "cc.Vec3",
@@ -72,7 +75,7 @@
       "__id__": 1
     },
     "_children": [],
-    "_active": true,
+    "_active": false,
     "_components": [
       {
         "__id__": 3
@@ -202,6 +205,142 @@
     "targetOverrides": null,
     "nestedPrefabInstanceRoots": null
   },
+  {
+    "__type__": "cc.Node",
+    "_name": "bd1",
+    "_objFlags": 0,
+    "__editorExtras__": {},
+    "_parent": {
+      "__id__": 1
+    },
+    "_children": [],
+    "_active": true,
+    "_components": [
+      {
+        "__id__": 9
+      },
+      {
+        "__id__": 11
+      }
+    ],
+    "_prefab": {
+      "__id__": 13
+    },
+    "_lpos": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 29.758,
+      "z": 0
+    },
+    "_lrot": {
+      "__type__": "cc.Quat",
+      "x": 0,
+      "y": 0,
+      "z": 0,
+      "w": 1
+    },
+    "_lscale": {
+      "__type__": "cc.Vec3",
+      "x": 0.6,
+      "y": 0.6,
+      "z": 1
+    },
+    "_mobility": 0,
+    "_layer": 1,
+    "_euler": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_id": ""
+  },
+  {
+    "__type__": "cc.UITransform",
+    "_name": "",
+    "_objFlags": 0,
+    "__editorExtras__": {},
+    "node": {
+      "__id__": 8
+    },
+    "_enabled": true,
+    "__prefab": {
+      "__id__": 10
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 140,
+      "height": 80
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_id": ""
+  },
+  {
+    "__type__": "cc.CompPrefabInfo",
+    "fileId": "6ddat2wt5BrrgXLQtOBT2e"
+  },
+  {
+    "__type__": "cc.Sprite",
+    "_name": "",
+    "_objFlags": 0,
+    "__editorExtras__": {},
+    "node": {
+      "__id__": 8
+    },
+    "_enabled": true,
+    "__prefab": {
+      "__id__": 12
+    },
+    "_customMaterial": null,
+    "_srcBlendFactor": 2,
+    "_dstBlendFactor": 4,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_spriteFrame": {
+      "__uuid__": "3d46f945-3f07-477e-a95a-b49557d552c6@a1295",
+      "__expectedType__": "cc.SpriteFrame"
+    },
+    "_type": 0,
+    "_fillType": 0,
+    "_sizeMode": 1,
+    "_fillCenter": {
+      "__type__": "cc.Vec2",
+      "x": 0,
+      "y": 0
+    },
+    "_fillStart": 0,
+    "_fillRange": 0,
+    "_isTrimmedMode": true,
+    "_useGrayscale": false,
+    "_atlas": null,
+    "_id": ""
+  },
+  {
+    "__type__": "cc.CompPrefabInfo",
+    "fileId": "a3uKPSs/FEhakvLR8kabs9"
+  },
+  {
+    "__type__": "cc.PrefabInfo",
+    "root": {
+      "__id__": 1
+    },
+    "asset": {
+      "__id__": 0
+    },
+    "fileId": "33/DXpxXdLHLHcRuMJV8OF",
+    "instance": null,
+    "targetOverrides": null,
+    "nestedPrefabInstanceRoots": null
+  },
   {
     "__type__": "cc.UITransform",
     "_name": "",
@@ -212,7 +351,7 @@
     },
     "_enabled": true,
     "__prefab": {
-      "__id__": 9
+      "__id__": 15
     },
     "_contentSize": {
       "__type__": "cc.Size",
@@ -240,7 +379,7 @@
     },
     "_enabled": true,
     "__prefab": {
-      "__id__": 11
+      "__id__": 17
     },
     "playOnLoad": true,
     "_clips": [