feat: enhance backup import functionality to handle skipped items and provide detailed feedback

webapp/src/lib/api/backup.ts

@@ -86,9 +86,23 @@ export interface AdminBackupImportCounts {
   sendFiles: number;
 }
 
+export interface AdminBackupImportSkippedItem {
+  kind: 'attachment' | 'send-file';
+  path: string;
+  sizeBytes: number;
+}
+
+export interface AdminBackupImportSkipped {
+  reason: string | null;
+  attachments: number;
+  sendFiles: number;
+  items: AdminBackupImportSkippedItem[];
+}
+
 export interface AdminBackupImportResponse {
   object: 'instance-backup-import';
   imported: AdminBackupImportCounts;
+  skipped: AdminBackupImportSkipped;
 }
 
 export interface AdminBackupExportPayload {

webapp/src/lib/i18n.ts

@@ -25,6 +25,8 @@ const messages: Record<Locale, Record<string, string>> = {
     txt_backup_export_success: "Backup exported",
     txt_backup_import_success_relogin: "Backup restored. Please sign in again.",
     txt_backup_restore_success_relogin: "Backup restored. Please sign in again.",
+    txt_backup_restore_skipped_summary: "{reason}. Skipped {attachments} attachment(s) and {sendFiles} Send file(s).",
+    txt_backup_restore_skipped_reason_default: "Some files could not be restored",
     txt_backup_export_failed: "Backup export failed",
     txt_backup_import_failed: "Backup restore failed",
     txt_backup_restore_failed: "Backup restore failed",
@@ -606,6 +608,8 @@ const zhCNOverrides: Record<string, string> = {
   txt_backup_export_success: '备份已导出',
   txt_backup_import_success_relogin: '备份已还原，请重新登录',
   txt_backup_restore_success_relogin: '备份已还原，请重新登录',
+  txt_backup_restore_skipped_summary: '{reason}，已跳过 {attachments} 个附件和 {sendFiles} 个 Send 文件',
+  txt_backup_restore_skipped_reason_default: '部分文件无法还原',
   txt_backup_export_failed: '备份导出失败',
   txt_backup_import_failed: '备份还原失败',
   txt_backup_restore_failed: '备份还原失败',