Update from code changes: chargeback alert billing flow

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Summary

Documents the new admin chargeback-alert billing flow (preventive refund + per-merchant fee + new charge statuses) added in fastsoftbrasil/global-whitelabel-payment-gateway#631.

Changes

• New guide guias/alertas-de-chargeback.mdx covering when to use the flow, fee configuration via merchant_settings.chargeback_alert_fee (admin modal or POST /v1/merchants/:id/settings), the POST /v1/charges/:id/chargeback-alert endpoint, the manual-refund-request fallback (GET /v1/manual-refund-requests, POST /v1/manual-refund-requests/:id/resolve), how the fee shows up in /v1/statement (chargeback_alert_fee movement / chargeback_alert referenceType) and the new pre_chargeback / chargeback charge statuses, plus the new admin permissions (admin.chargeback_alerts.create, admin.manual_refund_requests.read, admin.manual_refund_requests.update).
• api-reference/openapi.yaml: added the three new admin endpoints, extended the charge status filter on GET /v1/charges and POST /v1/charges/{id}/resend-webhook with pre_chargeback and chargeback.
• Registered the new page under Recursos in docs.json.

Context

Source: fastsoftbrasil/global-whitelabel-payment-gateway#631 — feat: cobrança de alertas de chargeback (estorno + taxa + extrato/relatório).

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