- Extract shared infrastructure: BffDbConnectionFactory, TenantContext (per-request cache) - Extract 19 DTOs to Models/BffDtos.cs - Create 10 controllers: Shop, Catalog, Staff, Order, Inventory, Financial, Booking, Fnb, Reports, Membership - Register DI services in Program.cs - Delete monolithic BffDataController.cs (1831 lines) - All API routes preserved under api/bff prefix (zero breaking changes)