配置应用图标：支持 Windows NSIS 安装包正确显示图标

- 添加跨平台图标配置（Windows .ico、macOS .icns、Linux .png）
- 配置 Windows 双重构建目标：NSIS 安装程序 + Portable 版本
- 解决 Windows 下 exe 文件显示默认图标的问题
- NSIS 安装程序版本可正确显示自定义图标

package.json

@@ -41,6 +41,7 @@
     "directories": {
       "output": "release"
     },
+    "icon": "build/icon.ico",
     "files": [
       "dist/**/*",
       "node_modules/**/*",
@@ -50,13 +51,25 @@
       "!node_modules/.bin"
     ],
     "mac": {
-      "category": "public.app-category.developer-tools"
+      "category": "public.app-category.developer-tools",
+      "icon": "build/icon.icns"
     },
     "win": {
-      "target": "portable"
+      "target": [
+        {
+          "target": "nsis",
+          "arch": ["x64"]
+        },
+        {
+          "target": "portable", 
+          "arch": ["x64"]
+        }
+      ],
+      "icon": "build/icon.ico"
     },
     "linux": {
-      "target": "AppImage"
+      "target": "AppImage",
+      "icon": "build/icon.png"
     }
   }
 }