feat: fase 2 - services externos (dte, transbank, email)
- New solution ServicesExternos.slnx with standalone API project
- DteService + DteController (LibreDTE: emitir, generar PDF, consultar folio)
- TransbankService + TransbankController (crear transacción, confirmar, voucher SP)
- EmailService + EmailController (MailKit: send with HTML + attachments)
- Models for DTE, Transbank, Email requests/responses
- Dockerfile + appsettings.json with all service configs
- HttpClient factory for Transbank and LibreDTE
- Build: 0 errors
Nurfog
c43dbcce8b