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/handoff/after-backend-phase-1.md

@@ -0,0 +1,58 @@
+# After backend-phase-1 — what b2…b15 and the frontend can rely on
+
+The **platform backbone** is live. Six cross-cutting tables exist in a new **`ops` schema** on top of
+b0's `InitialBaseline`, seeded with real config + a sample holiday calendar. The mechanisms every later
+phase needs — typed config, holiday math, audit trail, analytics, in-app notifications, support alerts —
+are built **once, here**, behind Application contracts. **Reuse them; do not re-create the tables.**
+
+## Internal contracts b2…b15 must depend on (never reinvent)
+All are DI-registered (Scoped) and implemented in `Baya.Infrastructure.Persistence/Services/`:
+
+- **`IPlatformConfig`** — `GetConfig<T>(key)` (cached, parsed by `data_type`), `SetConfig(key,value)`
+  (audited, evicts cache), `ListAsync`, `GetConfigChangeHistory(key)`. **Read money-critical constants
+  here at compute time — never hardcode.** Seeded keys: `platform_fee_rate`, `vat_rate` (0.10),
+  `dispute_window_hours` (72), `booking_payment_deadline_minutes` (30), `nurse_response_deadline_hours`,
+  `nurse_payout_interval_days`, `evv_location_tolerance_meters`, `min_rating_for_support_alert`,
+  `bnpl_merchant_of_record`, `bnpl_provider_commission_rate`, `bnpl_settlement_timing`,
+  `cancellation_tiers`. **Snapshot the rate you use onto the priced row** — a later config change must not
+  re-price it.
+- **`IHolidayCalendar`** — `IsHoliday`, `IsBankClosed`, `NextBusinessDay` (skips bank-closed days + the
+  Iranian banking weekend = Friday), plus admin CRUD. **b13 payout scheduling calls `NextBusinessDay`.**
+- **`IAuditLogger`** — `WriteAsync(entityType, entityId, action, changedFields?)` for state changes with
+  no row diff, plus `GetTrailAsync`. Row-level diffs on **`IAuditable`** entities are written
+  automatically by the extended `AuditFieldInterceptor` (mark an entity `IAuditable`; annotate encrypted
+  props `[AuditRedacted]`). `platform_configs` is the first `IAuditable` entity. **`audit_logs` is
+  append-only — never update/delete it.**
+- **`IAnalyticsSink`** — `EmitAsync(name, props)`; fire-and-forget (`system_events`). **Never** route
+  compliance facts here — those go to `IAuditLogger`.
+- **`INotificationDispatcher`** — `DispatchAsync(Notification(userId, type, title, body?, dataJson?))`
+  now writes a **real in-app `notifications` row** (b0 stub gone). This is how booking/payment/review
+  domains mint a user notification. `data_json` is a **typed, versioned deep-link payload** — version it.
+- **`INotificationService`** — per-user reads/commands (list unread-first, unread count, mark read/all,
+  purge). Always tenant-scoped to `ICurrentUser`.
+- **`ISupportAlertService`** — `RaiseAsync(type, entityType, entityId, severity, bookingId?, reviewId?)`
+  for review/EVV/verification/payment flows to call, plus assign/resolve/list. **Support alerts are
+  admin-only — never surface them on a user-facing route or in a user `notification`.**
+
+## Live endpoints (contract: `dev/contracts/domains/config-reference.md`)
+Admin (`DynamicPermission`): `platform_config/*`, `holidays/*`, `audit/get_audit_trail`,
+`support_alerts/*`. Current-user (`Authorize`): `notifications/*` (f14 notification center;
+f15 admin config/holidays/audit/alerts). Envelope unchanged (camelCase body, snake_case URLs); lists
+paginated `page`/`page_size`.
+
+## Migration / schema
+New migration **`20260701193257_InitialMarketplaceBaseline`** — the marketplace baseline every later
+phase adds onto. Applied cleanly to the dev DB (tables + indexes + seed present). Tables live in **`ops`**
+(keep new marketplace tables off `usr`).
+
+## Follow-ups later phases must close
+- **FK constraints for `support_alerts.booking_id` / `review_id`.** The columns exist now (no FK yet).
+  **b9** (bookings) adds `FK SupportAlerts.BookingId → Bookings`; **b14** (reviews) adds
+  `FK SupportAlerts.ReviewId → Reviews`. Do it in the migration that creates those tables.
+- **Make-it-real seams (🟡):** `IHolidayCalendar` (real feed/sync), `IAnalyticsSink` (warehouse),
+  `IJobScheduler` retention (Hangfire/Quartz), `INotificationDispatcher` SMS/push channels — see
+  `reports/mocks-registry.md`.
+
+## Caveat (unchanged from b0)
+Non-Development Serilog targets the `logDb` connection; Development boots against the configured
+`SqlServer`. A reachable SQL Server is required to run the API (it applies migrations + seeds on boot).