feat: add data import/export bundle

frontend/src/i18n/locales/en.ts

@@ -1188,6 +1188,28 @@ export default {
       refreshInterval30s: '30 seconds',
       autoRefreshCountdown: 'Auto refresh: {seconds}s',
       syncFromCrs: 'Sync from CRS',
+      dataExport: 'Export',
+      dataExportSelected: 'Export Selected',
+      dataExportIncludeProxies: 'Include proxies (unchecked = no proxy linkage on import)',
+      dataImport: 'Import',
+      dataExportConfirmMessage: 'The exported data contains sensitive account and proxy information. Store it securely.',
+      dataExportConfirm: 'Confirm Export',
+      dataExported: 'Data exported successfully',
+      dataExportFailed: 'Failed to export data',
+      dataImportTitle: 'Import Data',
+      dataImportHint: 'Upload the exported JSON file to import accounts and proxies.',
+      dataImportWarning: 'Import will create new accounts/proxies; groups must be bound manually. Ensure no conflicts in the target instance.',
+      dataImportFile: 'Data file',
+      dataImportButton: 'Start Import',
+      dataImporting: 'Importing...',
+      dataImportSelectFile: 'Please select a data file',
+      dataImportParseFailed: 'Failed to parse data file',
+      dataImportFailed: 'Data import failed',
+      dataImportResult: 'Import Result',
+      dataImportResultSummary: 'Proxies created {proxy_created}, reused {proxy_reused}, failed {proxy_failed}; Accounts created {account_created}, failed {account_failed}',
+      dataImportErrors: 'Error Details',
+      dataImportSuccess: 'Import completed: accounts {account_created}, failed {account_failed}',
+      dataImportCompletedWithErrors: 'Import completed with errors: account failed {account_failed}, proxy failed {proxy_failed}',
       syncFromCrsTitle: 'Sync Accounts from CRS',
       syncFromCrsDesc:
         'Sync accounts from claude-relay-service (CRS) into this system (CRS is called server-to-server).',
@@ -1879,6 +1901,11 @@ export default {
       createProxy: 'Create Proxy',
       editProxy: 'Edit Proxy',
       deleteProxy: 'Delete Proxy',
+      dataExport: 'Export',
+      dataExportConfirmMessage: 'The exported data contains sensitive proxy information. Store it securely.',
+      dataExportConfirm: 'Confirm Export',
+      dataExported: 'Data exported successfully',
+      dataExportFailed: 'Failed to export data',
       searchProxies: 'Search proxies...',
       allProtocols: 'All Protocols',
       allStatus: 'All Status',