Embedded pages (purchase subscription, custom pages) now receive the current user locale through a `lang` URL parameter, allowing iframe content to match the user's language preference. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Move ADMIN_PAYMENT_INTEGRATION_API.md → docs/ADMIN_PAYMENT_INTEGRATION_API.md - Update README.md reference path - Add payment integration doc download link in admin settings UI (Purchase section) - Add i18n keys: integrationDoc / integrationDocHint (zh + en)