fix: revert to require(https), reduce to 9 active clients, filter zero spend

- Revert Buscar e Formatar Todos back to require('https') - \$helpers
  is not available in n8n Code nodes
- Revert Enviar Relatório WhatsApp to bodyParameters (was working for
  single client reports before change broke it)
- Revert all 4 tool nodes back to require('https')
- Reduce automatic report list from 13 to 9 active clients:
  Agro, Arte em Gelo, Batata Bistrô, Caribbean Bronze, Escola de Música,
  GFiX Store, Hi Dogz, ITAG Tecnologia, Panmalhas Assessoria Têxtil
- Skip accounts with R$ 0 spend in the period (return null + filter)
- Keep Promise.all for parallel requests (faster)

https://claude.ai/code/session_01TSV3FcRdbPFXKZUAftjEoQ

Author: claude