ci: 更新 GitHub Actions 构建矩阵

- 为 Windows 和 Linux 构建产物添加平台名称后缀
- 保持原有构建配置不变

.github/workflows/main.yml

@@ -17,10 +17,10 @@ jobs:
       fail-fast: false
       matrix:
         build:
-          - name: 'go-stock.exe'
+          - name: 'go-stock-${{ matrix.build.platform }}.exe'
             platform:  'windows/amd64'
             os: 'windows-latest'
-          - name: 'go-stock'
+          - name: 'go-stock-${{ matrix.build.platform }}'
             platform: 'linux/amd64'
             os: 'ubuntu-latest'