Regenerated initial migrations for account, advertisement, commerce, configuration, and social apps to include recent schema changes and remove obsolete migration files. Added new migrations for Deutsche Post and Zasilkovna integrations, including new fields and choices. Updated commerce models to improve currency handling and discount code logic. This unifies the database schema and prepares for new features and integrations.
Removed per-product currency in favor of a global site currency managed via SiteConfiguration. Updated models, views, templates, and Stripe integration to use the global currency. Added migration, management command for migration, and API endpoint for currency info. Improved permissions and filtering for orders, reviews, and carts. Expanded supported currencies in configuration.
