M9.1: wire sync logging into all mutation paths

- Add LogClosedDayDelete and LogClosedWeekDelete to SyncStore
- Inject syncStore into EntryService; log Start, Stop, StopByID,
  Update, CreateInterval, Delete, AutoStopStalledEntries
- Inject syncStore into DayService; log CloseDay, MarkDay, ReopenDay,
  and the recomputeWeek closed-week upsert
- Inject syncStore into SettingsService; log Upsert, UpdateSettings,
  DeleteSettings
- Add LogClosedWeek/LogClosedWeekDelete calls in WeekService.CloseWeek
  and ReopenWeek
- Update main.go and all service test helpers for new constructor signatures
- All Go tests and 19 Vitest tests pass

internal/service/week_service.go

@@ -238,6 +238,7 @@ func (s *WeekService) CloseWeek(ctx context.Context, weekKey string) (*domain.Cl
 	if err := s.closedWeeks.Upsert(ctx, cw); err != nil {
 		return nil, err
 	}
+	_ = s.syncStore.LogClosedWeek(ctx, cw)
 	return cw, nil
 }
 
@@ -254,7 +255,11 @@ func (s *WeekService) ReopenWeek(ctx context.Context, weekKey string) error {
 	if existing == nil {
 		return ErrWeekNotClosed
 	}
-	return s.closedWeeks.Delete(ctx, weekKey)
+	if err := s.closedWeeks.Delete(ctx, weekKey); err != nil {
+		return err
+	}
+	_ = s.syncStore.LogClosedWeekDelete(ctx, weekKey)
+	return nil
 }
 
 // ListWeeks returns closed weeks within a range.