feat(domain): herregistratie reminder sweep on a Quartz cron (S-17, closes #18) (#121)

## What & why

S-17: a BIG inscription is valid for a fixed term; before it lapses the zorgprofessional must herregistreren. This adds a **daily herregistratie reminder sweep**.

- **Domain:** `Approve(ingeschrevenOp)` now stamps the inscription moment; `HerregistratieVoor` derives the deadline (inscription + 5-year validity); `HerregistratieReminderDue(asOf)` is the single rule (inside the 90-day window, inscribed, not yet reminded); `MarkHerregistratieReminderVerstuurd()` is idempotent.
- **Store:** `FindDueForHerregistratieReminderAsync(asOf)` — the sweep's candidate set, filtered on the aggregate's own rule (no duplicated policy).
- **Application:** `HerregistratieReminderSweep` — pure over the store + an injected `TimeProvider`; flags + persists each due inscription, returns the reminded ids.
- **Infra/API:** `HerregistratieReminderJob` (Quartz `IJob`) fires the sweep on a daily cron (03:00, overridable via `Quartz__Cron`) and logs the count. `GET /registrations/{id}` surfaces `herregistratieVoor` + `herregistratieReminderVerstuurd`.

**Decisions (both raised with you before coding):** use Quartz.NET as the PRD names it — a genuine cron concern, distinct from the queue-draining pumps, which stay as-is (**ADR-0022**, proposal #120); and the reminder's observable effect is a flag on the aggregate + a log line (no outbound notification infra in v1). No coupling rule (§8) is touched — Quartz is internal to the Domain Service.

Closes #18
Closes #120

## Definition of Done

- [x] Linked Gitea issue (above).
- [x] Failing test committed before the implementation (red→green per layer: domain rule, store query, sweep).
- [x] Implementation makes the test pass; refactor commit for the 90-day knob.
- [x] Conventional Commits referencing the issue (`refs #18`).
- [ ] CI green — awaiting Gitea Actions.
- [ ] `docker compose up` reaches green health checks within 3 minutes — API boots locally with Quartz initialised; verified in CI compose smoke.
- [x] Docs updated — ADR-0022, demo-script, BACKLOG.
- [x] ADR added — `docs/architecture/adr-0022-quartz-scheduler.md`.
- [x] Demo note in `docs/demo-script.md`.

## Notes for reviewers

- **Ripple:** `Approve()` gained the inscription moment, so the two approving handlers (`ApproveRegistration`, `BeoordeelRegistratie`) now take an injected `TimeProvider`; existing tests pass a fixed clock. All three `IRegistrationStore` implementers (prod, unit fake, acceptance) got the new query.
- **Calibration knobs:** validity (5y) and reminder lead time (90d) are domain constants marked with `ponytail:` comments; promotion path to beheer config (S-15) noted in the ADR.
- **Mutation:** the Quartz job shell is excluded from Stryker, mirroring the pumps; all rule/sweep/query logic is covered.
- Local: 152 domain unit tests green; API boots with the Quartz scheduler and `/health` green.

Reviewed-on: #121

services/domain/Big.Tests/BeoordeelRegistratieTests.cs

@@ -29,7 +29,7 @@ public class BeoordeelRegistratieTests
         var registration = WithZaak();
         store.Seed(registration);
         var tasks = TaskFor(registration);
-        var handler = new BeoordeelRegistratie(store, acl, tasks);
+        var handler = new BeoordeelRegistratie(store, acl, tasks, TimeProvider.System);
 
         await handler.HandleAsync(new BeoordeelRegistratieCommand(registration.Id, BeoordelingsBesluit.Goedkeuren));
 
@@ -50,7 +50,7 @@ public class BeoordeelRegistratieTests
         var registration = WithZaak();
         store.Seed(registration);
         var tasks = TaskFor(registration);
-        var handler = new BeoordeelRegistratie(store, acl, tasks);
+        var handler = new BeoordeelRegistratie(store, acl, tasks, TimeProvider.System);
 
         await handler.HandleAsync(new BeoordeelRegistratieCommand(registration.Id, BeoordelingsBesluit.Afwijzen));
 
@@ -69,7 +69,7 @@ public class BeoordeelRegistratieTests
         var registration = WithZaak();
         registration.TakeIntoBehandeling();
         store.Seed(registration);
-        var handler = new BeoordeelRegistratie(store, acl, TaskFor(registration));
+        var handler = new BeoordeelRegistratie(store, acl, TaskFor(registration), TimeProvider.System);
 
         await handler.HandleAsync(new BeoordeelRegistratieCommand(registration.Id, BeoordelingsBesluit.Goedkeuren));
 
@@ -81,7 +81,7 @@ public class BeoordeelRegistratieTests
     {
         var store = new FakeRegistrationStore();
         var acl = new FakeAclClient();
-        var handler = new BeoordeelRegistratie(store, acl, new FakeUserTaskClient([]));
+        var handler = new BeoordeelRegistratie(store, acl, new FakeUserTaskClient([]), TimeProvider.System);
 
         await Assert.ThrowsAsync<ArgumentNullException>(() => handler.HandleAsync(null!));
         Assert.Equal(0, acl.ApproveCallCount);
@@ -93,7 +93,7 @@ public class BeoordeelRegistratieTests
     {
         var store = new FakeRegistrationStore();
         var acl = new FakeAclClient();
-        var handler = new BeoordeelRegistratie(store, acl, new FakeUserTaskClient([]));
+        var handler = new BeoordeelRegistratie(store, acl, new FakeUserTaskClient([]), TimeProvider.System);
 
         var ex = await Assert.ThrowsAsync<InvalidOperationException>(() =>
             handler.HandleAsync(new BeoordeelRegistratieCommand(RegistrationId.New(), BeoordelingsBesluit.Goedkeuren)));
@@ -108,7 +108,7 @@ public class BeoordeelRegistratieTests
         var acl = new FakeAclClient();
         var registration = Registration.Submit("123456782"); // no zaak yet
         store.Seed(registration);
-        var handler = new BeoordeelRegistratie(store, acl, TaskFor(registration));
+        var handler = new BeoordeelRegistratie(store, acl, TaskFor(registration), TimeProvider.System);
 
         var ex = await Assert.ThrowsAsync<InvalidOperationException>(() =>
             handler.HandleAsync(new BeoordeelRegistratieCommand(registration.Id, BeoordelingsBesluit.Goedkeuren)));
@@ -123,7 +123,7 @@ public class BeoordeelRegistratieTests
         var acl = new FakeAclClient();
         var registration = WithZaak();
         store.Seed(registration);
-        var handler = new BeoordeelRegistratie(store, acl, TaskFor(registration));
+        var handler = new BeoordeelRegistratie(store, acl, TaskFor(registration), TimeProvider.System);
 
         await handler.HandleAsync(new BeoordeelRegistratieCommand(registration.Id, BeoordelingsBesluit.Goedkeuren));
         await handler.HandleAsync(new BeoordeelRegistratieCommand(registration.Id, BeoordelingsBesluit.Goedkeuren));
@@ -139,7 +139,7 @@ public class BeoordeelRegistratieTests
         var acl = new FakeAclClient();
         var registration = WithZaak();
         store.Seed(registration);
-        var handler = new BeoordeelRegistratie(store, acl, TaskFor(registration));
+        var handler = new BeoordeelRegistratie(store, acl, TaskFor(registration), TimeProvider.System);
 
         await handler.HandleAsync(new BeoordeelRegistratieCommand(registration.Id, BeoordelingsBesluit.Afwijzen));
         await handler.HandleAsync(new BeoordeelRegistratieCommand(registration.Id, BeoordelingsBesluit.Afwijzen));
@@ -158,7 +158,7 @@ public class BeoordeelRegistratieTests
         var registration = WithZaak();
         store.Seed(registration);
         var tasks = new FakeUserTaskClient([]); // no open task for this registration
-        var handler = new BeoordeelRegistratie(store, acl, tasks);
+        var handler = new BeoordeelRegistratie(store, acl, tasks, TimeProvider.System);
 
         await handler.HandleAsync(new BeoordeelRegistratieCommand(registration.Id, BeoordelingsBesluit.Goedkeuren));