BRS Premier Restaurant

Easily split bills evenly or per item across two or more seats. Improved Print All and added parallel printing. Added cash voucher payments and Basket API support. Added manual discounts on Register and Payment pages. Added pagination across requests for improved performance. Added customer numbers and editable custom table names, with duplicate-name prevention. Improved invoice emailing, including attachment filtering and missing-template error handling. Retains user-specific state when switching users. Migrated iOS dependency management to Swift Package Manager. Refined printing, emailing, Cash Up document reading, and payment-page state handling. Improved manual and automatic discount cap behaviour. Other bug fixes.