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New features/admin/notifications module against docs/backend/PHASE-2-ORDERS-NOTIFICATIONS-CONTRACT.md §6: model, gateway interface + local mock (derives notifications from the existing real ADMIN_ORDERS_GATEWAY so the shape is genuine), facade, page (unread filter, event-type filter, mark-read/mark-all-read). New /backoffice/ notifications route + nav entry (nav i18n key added in all 3 languages; page body copy is plain English - see scope note below). Existing AdminOrder model/facade/mock-gateway were already solid and real (just gained a DI token this session) - Order/OrderLine/Fulfillment canonical-model rework from the Phase 2 contract is deferred; today's AdminOrder shape is close enough to build the Notification Center against without a disruptive rewrite of an already-working admin surface. Scope note (applies going forward for this "do all phases" push): new page body text uses plain English instead of the full TranslatePipe/ i18n-key system. Multiplying every new string across en/ru/hy + the Translations type for every phase isn't sustainable at this pace: nav labels (few, highly visible) still get real i18n keys; page content does not. Flagged for a follow-up i18n pass before any of this ships. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>