[codex] Document egress payment method

[javorosas]

Summary

• Document payment_method on Egress invoice create and edit schemas in the Spanish OpenAPI v2 spec.
• Mirror the same optional PUE-only field in the English OpenAPI v2 spec.

Validation

• ruby -e "require 'yaml'; %w[website/openapi_v2.yaml website/openapi_v2.en.yaml].each { |f| YAML.load_file(f); puts \"#{f} ok\" }"\n- git diff --check\n\n## Notes\n- pnpm --dir website typecheck currently fails before this change on src/theme/Navbar/Logo/index.tsx because TypeScript cannot resolve @docusaurus/theme-common.\n

[Copilot]

Pull request overview

This PR updates the OpenAPI v2 documentation to explicitly document the payment_method field for Egress (credit note) invoice create and edit input schemas, aligning the Spanish and English specs and clarifying that only PUE is allowed (and optional for Egress).

Changes:

• Added payment_method to InvoiceEgresoInput (create) in Spanish and English specs with enum: [PUE] and default: PUE.
• Added payment_method to InvoiceEgresoEditInput (edit) in Spanish and English specs with enum: [PUE] and matching descriptions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
website/openapi_v2.yaml	Documents payment_method for Egress invoice create/edit schemas as optional and restricted to PUE.
website/openapi_v2.en.yaml	Mirrors the same Egress-only payment_method documentation in the English OpenAPI spec.

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