add load and save to sats service

internal/service/statistics.go

@@ -1,9 +1,11 @@
 package service
 
 import (
+	"context"
+	"errors"
+
 	"github.com/LazyBachelor/LazyPM/internal/models"
 	"github.com/LazyBachelor/LazyPM/internal/storage"
-	"errors"
 )
 
 type StatisticsService struct {
@@ -19,6 +21,14 @@ func NewStatisticsService(storage *storage.Storage[models.Statistics]) (*Statist
 	}, nil
 }
 
+func (s *StatisticsService) Load(ctx context.Context) error {
+	return s.storage.Load()
+}
+
+func (s *StatisticsService) Save(ctx context.Context) error {
+	return s.storage.Save()
+}
+
 func (s *StatisticsService) GetStatistics() (models.Statistics, error) {
 	if s.storage.Data == nil {
 		return models.Statistics{}, errors.New("statistics data not initialized")