backend phase 1: config, reference & platform signals

Lay the cross-cutting platform backbone every later phase reads from. Adds
the first marketplace EF migration baseline (new `ops` schema) and the
mechanisms b2..b15 reuse: typed runtime config, an append-only audit trail,
an analytics event log, the holiday/bank-closure calendar, in-app
notifications, and the internal support-alert worklist.

Schema & migration
- New `ops` schema + migration InitialMarketplaceBaseline with 6 tables:
  PlatformConfigs (IAuditable), AuditLogs (append-only), SystemEvents,
  IranianHolidays, Notifications, SupportAlerts — with indexes/uniques and
  FKs to usr.Users. Seeded 12 config keys + 7 sample holidays via HasData.

Domain / Application
- IAuditable marker + [AuditRedacted] attribute; entities + string-code
  constant holders (config data_type, holiday type, alert type/severity/status).
- Facade contracts: IPlatformConfig, IHolidayCalendar, IAnalyticsSink,
  IAuditLogger, INotificationService, ISupportAlertService; DTOs +
  PagedResult<T>; evolved the INotificationDispatcher.Notification record to
  carry Type + DataJson; Pagination helper.
- 14 CQRS commands/queries (+ validators) wiring the endpoints to the facades.

Infrastructure
- DB-backed facade implementations in Persistence/Services/; real in-app
  INotificationDispatcher (removes the b0 log stub); notification-retention
  hosted service (purge is_read=1 AND age>90d).
- Extended AuditFieldInterceptor to also append an old/new-diff audit_logs row
  for every IAuditable change in the same transaction (PII redacted).
- Registered all facades + hosted service in AddPersistenceServices; removed
  the dispatcher registration from AddCrossCuttingSeams.

API
- 5 controllers: admin PlatformConfig/Holidays/Audit/SupportAlerts
  ([Authorize(DynamicPermission)]) + current-user Notifications ([Authorize]),
  all tenant-scoped and paginated. 16 Swagger paths total.

Money-correctness & safety rules honoured
- Config read at compute time (cached, parsed by data_type), never hardcoded;
  every config change is audited in the same transaction; audit_logs is
  append-only (no update/delete path); support alerts are admin-only;
  notifications are tenant-scoped; analytics is fire-and-forget.

Tests & docs
- 18 new foundation tests over in-memory SQLite (config typing + audit,
  holidays, notifications + tenancy + retention, support alerts, analytics);
  build clean (0 new code warnings), 22 tests green; migration applied to the
  dev DB and swagger.v1.json refreshed.
- Updated server Project map + CONVENTIONS, product data-model doc 12 (seeded
  config defaults), config-reference contract, mock registry, backend handoff/
  STATUS/report.

Follow-ups: add FK constraints for SupportAlerts.BookingId (b9) and ReviewId
(b14) when those tables land.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

dev/shared-working-context/backend/STATUS.md

@@ -12,6 +12,24 @@ One block per completed backend phase. Newest at the top. Backend lane writes he
 - **Notes for frontend:** <anything load-bearing>
 -->
 
+## backend-phase-1 — Config, reference & platform signals — 2026-07-02
+- **Shipped:** first marketplace migration baseline (`InitialMarketplaceBaseline`, new **`ops`** schema)
+  with 6 tables (`PlatformConfigs`, `AuditLogs`, `SystemEvents`, `IranianHolidays`, `Notifications`,
+  `SupportAlerts`) + seed (12 config keys, 7 holidays); platform-signal facades `IPlatformConfig` /
+  `IHolidayCalendar` / `IAnalyticsSink` / `IAuditLogger` / `INotificationService` / `ISupportAlertService`
+  (`Persistence/Services/`); `AuditFieldInterceptor` extended to write append-only `audit_logs` rows for
+  `IAuditable` entities; real in-app `INotificationDispatcher` (b0 stub removed); notification-retention
+  hosted service; 5 controllers (admin config/holidays/audit/support-alerts + current-user notifications).
+- **Contracts:** `dev/contracts/domains/config-reference.md` + openapi snapshot refreshed (yes — 16 paths).
+- **Mocked:** `IHolidayCalendar`, `IAnalyticsSink`, retention `IJobScheduler` → 🟡; `INotificationDispatcher`
+  flipped to in-app-real 🟡 (SMS/push deferred). See reports/mocks-registry.md.
+- **Gate:** build clean (0 new code warnings) / tests green (22 pass: 4 identity + 18 foundation). Migration
+  applied to the dev DB; API boots with all 16 paths in Swagger; retention job runs on startup.
+- **Handoff:** backend/handoff/after-backend-phase-1.md
+- **Notes for frontend:** f14 = `notifications/*` (envelope unchanged; unread-first lists; `data_json` is a
+  typed deep-link payload). f15 = admin `platform_config/*`, `holidays/*`, `audit/get_audit_trail`,
+  `support_alerts/*` (DynamicPermission). Pagination `page`/`page_size` (default 50, max 100).
+
 ## backend-phase-0 — Foundation, cross-cutting seams & starter cleanup — 2026-06-28
 - **Shipped:** removed the `Order` demo (entity/feature/repo/config/gRPC) + 3 old migrations; fresh
   `InitialBaseline` migration; REST surface (`PingController` + `System/Ping` CQRS); `ICurrentUser` +