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/day_service_test.go

@@ -22,11 +22,12 @@ func newTestDayServices(t *testing.T) (*service.EntryService, *service.DayServic
 	closedDayStore := store.NewClosedDayStore(db)
 	closedWeekStore := store.NewClosedWeekStore(db)
 	settingsStore := store.NewSettingsStore(db)
+	syncStore := store.NewSyncStore(db)
 	tz, _ := time.LoadLocation("UTC")
 
-	entrySvc := service.NewEntryService(entryStore, closedDayStore, settingsStore, tz)
-	daySvc := service.NewDayService(entryStore, closedDayStore, closedWeekStore, settingsStore, tz)
-	settingsSvc := service.NewSettingsService(settingsStore)
+	entrySvc := service.NewEntryService(entryStore, closedDayStore, settingsStore, syncStore, tz)
+	daySvc := service.NewDayService(entryStore, closedDayStore, closedWeekStore, settingsStore, syncStore, tz)
+	settingsSvc := service.NewSettingsService(settingsStore, syncStore)
 	return entrySvc, daySvc, settingsSvc
 }