feat: Implement recursive storage listing and directory browsing for backups, and add a migration option to fix cross-filters.

frontend/src/types/backup.ts

@@ -7,9 +7,11 @@
 export interface Backup {
   id: string;
   name: string;
+  path: string;
   environment: string;
   created_at: string;
   size_bytes?: number;
+  is_directory?: boolean;
   status: 'success' | 'failed' | 'in_progress';
 }
 
@@ -19,4 +21,4 @@ export interface BackupCreateRequest {
 
 /**
  * [/DEF:BackupTypes:Module]
- */
+ */