fix: 修复 FactoryReset 误删用户文件并将应用数据迁移至 Application Support

- 修复 macOS/Windows/Linux 非沙盒下 FactoryReset 递归删除 ~/Documents 导致用户项目源代码丢失的严重 bug，改为仅删除已知应用专属文件/子目录并增加路径安全校验

- 数据库文件从 getApplicationDocumentsDirectory() 迁移到 getApplicationSupportDirectory()（应用专属），含自动迁移逻辑

- 启用 macOS Debug 模式沙盒，使开发环境与生产环境路径行为一致

- 统一迁移 13 处应用数据存储位置（Hive、聊天附件、字体、稍后读同步等）到 Application Support，应用启动时执行一次性迁移

- backup_service.dart 备份文件迁移至 Application Support，getBackupList() 兼容扫描新旧两个路径并去重

- clearCache() 同样修复危险递归清空逻辑

详见 CHANGELOG.md v6.136.0 ~ v6.138.0

lib/features/file_transfer/services/cache_manager_service.dart

@@ -58,7 +58,7 @@ class CacheManagerService {
   ];
 
   Future<String> _getBasePath() async {
-    final dir = await getApplicationDocumentsDirectory();
+    final dir = await getApplicationSupportDirectory();
     return '${dir.path}${Platform.pathSeparator}file_transfer';
   }
 

lib/features/file_transfer/services/cloud_cache_service.dart

@@ -348,7 +348,7 @@ class CloudCacheService {
       if (savePath != null) {
         outputPath = savePath;
       } else {
-        final dir = await getApplicationDocumentsDirectory();
+        final dir = await getApplicationSupportDirectory();
         outputPath =
             '${dir.path}${Platform.pathSeparator}cloud_cache${Platform.pathSeparator}${record.fileName}';
         await Directory(outputPath).parent.create(recursive: true);