- Create pagos_confirmados table to track consumed email receipts
- PagoValidadorService now validates: valor + fecha + hora (±10min) + llave Bancolombia
- Each matched email is hashed (sha1 body+date) and marked as used; a second
match returns estado=ya_usado instead of confirmado
- Add partial remitente name matching against the registered user's name
- GeminiVisionService prompt now extracts llave (@xxx) from the receipt image
- TelegramBotService shows distinct message for ya_usado state
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
