fix: 添加 GitHub Actions 写入权限配置 (#99)

- 添加 permissions: contents: write 配置
- 解决 403 权限错误问题
- 允许 GitHub Actions 创建 releases 和上传文件

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/release.yml

@@ -9,6 +9,9 @@ on:
       - 'go.sum'
   workflow_dispatch:
 
+permissions:
+  contents: write
+
 jobs:
   build:
     runs-on: ubuntu-latest