feat: hybrid cloud sync + fix table/KOT state after payment

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 KOT History drawer to KDS for traceability and reverification

fix: WAL checkpoint before backup — DB was 4KB (schema only) because WAL held all data

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

fix: include cmd/server directory - was excluded by bare 'server' pattern in gitignore