feat(admin): Add group filtering for account listings

- Add groupID parameter to ListAccounts and ListWithFilters methods
- Implement account filtering by group ID in repository query
- Add group query parameter parsing in account handler
- Update all ListAccounts/ListWithFilters call sites with groupID parameter
- Add group filter UI component to AccountTableFilters
- Add i18n translations for group filter label in English and Chinese
- Update API contract and test stubs to reflect new signature
- Enable filtering accounts by their assigned groups in admin panel

backend/internal/service/ops_concurrency.go

@@ -24,7 +24,7 @@ func (s *OpsService) listAllAccountsForOps(ctx context.Context, platformFilter s
 		accounts, pageInfo, err := s.accountRepo.ListWithFilters(ctx, pagination.PaginationParams{
 			Page:     page,
 			PageSize: opsAccountsPageSize,
-		}, platformFilter, "", "", "")
+		}, platformFilter, "", "", "", 0)
 		if err != nil {
 			return nil, err
 		}