[Feature]: Implement courier document-based import for COD payments and automatic voucher settlement

[PapLabros]

Describe the solution you'd like

This issue proposes implementing a mechanism for importing Cash On Delivery (COD) payment information using documents provided by couriers, such as PDF, Excel, CSV, or similar formats.

The system should be able to analyze courier-provided documents, extract COD payment information, and use it to automatically mark the corresponding vouchers in the ERP as paid. This will significantly reduce manual reconciliation work and improve accuracy when handling COD settlements.

To support multiple couriers consistently, a common abstract API must be defined in the ICouriersClient, allowing each courier implementation to provide its own document parsing and mapping logic while exposing a unified interface to the rest of the system.

Alternatives you've considered

No response

Additional context

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