cbe1e6b470
Android 10+ 受 scoped storage 限制，getDownloadsDirectory() 返回的是 app-specific 目录 (/storage/emulated/0/Android/data/.../files/Download/)， 而非用户可见的 /storage/emulated/0/Download/。 新增 MainActivity 端 MethodChannel com.xiarui.kuaishai2/downloads： - API 29+：MediaStore.Downloads 写入公共 Downloads，无需权限 - API <=28：直接写 /storage/emulated/0/Download/（需 WRITE_EXTERNAL_STORAGE） Dart 端 ExcelTemplateService 改用 MethodChannel，Android 平台返回 Download/<filename> 显示路径；其它平台保留 getDownloadsDirectory 行为。 返回值由 File 改为 String，调用方已同步更新。
kuaishai2
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