Guest QR menu shows a "ساختهشده با میزی" watermark under the menu unless the café's
plan has the `watermark_removed` feature (Starter+).
- PublicMenuDto gains ShowWatermark; PublicService computes it from
IsFeatureEnabledForCafeAsync("watermark_removed") for both slug and branch menus.
- Guest menu renders the watermark footer when showWatermark.
- NoOpPlatformCatalogService test double (all features on) for the PublicService
ctor; QrMenuTests updated.
86 tests pass; dashboard tsc clean.
Full backend implementation:
- Multi-tenant cafe/restaurant management (menus, orders, tables, staff)
- POS order flow with ZarinPal and Snappfood payment integration
- OTP authentication via Kavenegar SMS
- QR digital menu with public discover/finder endpoints
- Customer loyalty, coupons, CRM
- PostgreSQL via EF Core, Redis for caching/sessions
- Background jobs, webhook handlers
- Full migration history
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>