feat: add Pine Labs EDC integration and WhatsApp conversational ordering

feat: add Swiggy/Zomato integration with webhook infrastructure, online order management, and platform config

feat: add thermal printer management with routing rules and print bill button

feat: add print settings tab + fix cleaning table color consistency

feat: add KOT History drawer to KDS for traceability and reverification

feat: redesign KDS with item-level food-ready, order grouping, and pending side pane

Initial commit: HSS POS restaurant management system