fix: 在目录选择器不可用时降级为浏览器下载 - #198
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修改说明
这个 PR 修复自托管 HTTP/IP 访问场景下，部分导出按钮可能无响应的问题。
在普通 HTTP 或服务器 IP 访问页面时，浏览器通常不是 secure context，
window.showDirectoryPicker()不可用。原导出流程会优先申请目录写入权限，因此 HTML / TXT / Markdown / Word / PDF 等导出方式在这类环境下可能无法继续执行。简单来说就是我把本项目部署到云上如果没有配置HTTPS就没法通过HTML / TXT / Markdown / Word / PDF 等方式导出。
本次修改增加了导出降级逻辑：
showDirectoryPicker()的 HTTPS / localhost 环境：保留原有目录导出行为showDirectoryPicker()或当前页面不是 secure context：自动降级为普通浏览器下载jszip打包为wechat-articles-html.zipfile-saver直接下载文件验证情况
已在自托管 HTTP 环境中验证：
本地检查：