feat: Add projection_list and T-2 window to upcoming bookings endpoint

perf(orders): Optimize concurrent API calls with asyncio.gather and refactor projection logic

feat(orders): Add field projection support to upcoming bookings endpoint

feat(auth): Extract partner_id from JWT in orders and dashboard routers

feat(auth): Standardize JWT authentication to match POS microservice pattern

fix(auth): use token partner_id instead of request payload for security

feat(leave,wallet): Add leave and wallet modules with JWT auth

feat(cart,orders): Add shopping cart and order management modules