refactor(OSSLicensesBuilder): 优化许可证信息获取逻辑

- 重构了处理许可证信息的代码，提高了代码可读性和维护性
- 使用常量存储 SPDX 许可证信息，减少重复查询
- 优化了 JSON 数据处理流程，提升了数据处理效率

Author: ArcticFoxPro

source/OSSLicensesBuilder.js

@@ -77,7 +77,8 @@ function buildLicenses(outputFile, customFormat, customPath, startPath = '') {
                 delete jsonDataWithoutLicenseText[key].licenseText;
                 jsonDataWithoutLicenseText[key].licenseTextHash = sha256Hash;
             } else jsonDataWithoutLicenseText[key].licenseTextHash = "";
-            if (spdx[value.licenses]) jsonDataWithoutLicenseText[key].licenses = spdx[value.licenses].name;
+            const spdxItem = spdx[value.licenses]
+            if (spdxItem) jsonDataWithoutLicenseText[key].licenses = spdxItem.name;
         }
         const jsContentWithoutLicenseText = `module.exports = ${JSON5.stringify(jsonDataWithoutLicenseText, null, 2)};`;
         const minifiedResultWithoutLicenseText = uglifyJS.minify(jsContentWithoutLicenseText, {