feat: add multi-tenant row-level security across 5 services and 96 FnB engine unit tests
Security (P0-5):
- Implement ITenantProvider + HttpContextTenantProvider per service (order, fnb, inventory, catalog, wallet)
- Add EF Core global query filters for tenant isolation (shop_id/user_id based)
- Add TenantMiddleware setting PostgreSQL session variables for RLS
- Create PostgreSQL RLS policies script (scripts/db/rls-policies.sql)
- Adapter pattern bridges API-layer to Infrastructure-layer (Clean Architecture)
- Bypass mechanisms for admin roles, service-to-service calls, and migrations
Testing (P1-12):
- Add 96 unit tests for fnb-engine (up from 3)
- 57 domain entity tests: Table(18), KitchenTicket(12), Session(8), Reservation(13), Recipe(6)
- 39 command handler tests: CRUD operations, status transitions, validation
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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