feat(backend): demo scheduler on the virtual clock — doses, missed, check-ins, scales, silence

- app/scheduler/demo.py: run_until(now) replays due and fresh events in time order: dose rows +
  med_reminder, missed after 2 h without an answer → monitoring, daily_checkin, scale_due by the
  config/modules.yaml schedules, daily monitoring pass (silence, missed doses) → reach_out/scale_due
- idempotent via scheduler_events (unique token+key); stale events are not sent; no contact without
  consent or during an open crisis
- config/scheduler.yaml: times and windows; runs while the questionnaire release is off
- POST /demo/clock/advance replays the scheduler up to the new time

Refs #13

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/api/routes.py

@@ -25,6 +25,7 @@ from app.api.schemas import (
 from app.core import clock
 from app.dialog.contracts import get_engine
 from app.integrations.base import MemoryOutbox, integrations
+from app.scheduler import jobs as scheduler
 
 router = APIRouter(prefix="/api/v1")
 router.include_router(questionnaire_router)
@@ -99,8 +100,9 @@ async def get_clock() -> ClockOut:
 
 @router.post("/demo/clock/advance", response_model=ClockOut, tags=["demo"])
 async def advance_clock(body: ClockAdvanceIn) -> ClockOut:
-    """Moves the virtual clock; #13 makes the scheduler replay all events up to the new time."""
+    """Moves the virtual clock and replays the scheduler up to the new time (#13)."""
     clock.advance(days=body.days, hours=body.hours)
+    await scheduler.run_until_now()
     return _clock_out()