feat(hero): 为英雄 mo4 添加轮廓发光效果

- 新增内置轮廓发光着色器效果文件
- 新增轮廓发光材质并配置红色发光参数
- 在 mo4 英雄预制件中应用轮廓发光材质
- 移除不再需要的嵌套预制件引用以简化结构

assets/resources/game/gui/materials/outline-glow.mtl

@@ -0,0 +1,41 @@
+{
+  "__type__": "cc.Material",
+  "_name": "",
+  "_objFlags": 0,
+  "__editorExtras__": {},
+  "_native": "",
+  "_effectAsset": {
+    "__uuid__": "cfeeea4f-db9c-42cd-a0f7-fc5cb37bd3d7",
+    "__expectedType__": "cc.EffectAsset"
+  },
+  "_techIdx": 0,
+  "_defines": [
+    {
+      "USE_TEXTURE": true
+    }
+  ],
+  "_states": [
+    {
+      "rasterizerState": {},
+      "depthStencilState": {},
+      "blendState": {
+        "targets": [
+          {}
+        ]
+      }
+    }
+  ],
+  "_props": [
+    {
+      "glowColor": {
+        "__type__": "cc.Color",
+        "r": 255,
+        "g": 20,
+        "b": 20,
+        "a": 255
+      },
+      "glowWidth": 0.0025,
+      "glowThreshold": 0.887
+    }
+  ]
+}

assets/resources/game/gui/materials/outline-glow.mtl.meta

@@ -0,0 +1,11 @@
+{
+  "ver": "1.0.21",
+  "importer": "material",
+  "imported": true,
+  "uuid": "2fcd55a9-38ca-45aa-9164-68e48aaf51ce",
+  "files": [
+    ".json"
+  ],
+  "subMetas": {},
+  "userData": {}
+}